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 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 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 };
  67
  68 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  69 {
  70         return (struct pfkey_sock *)sk;
  71 }
  72
  73 static int pfkey_can_dump(const struct sock *sk)
  74 {
  75         if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
  76                 return 1;
  77         return 0;
  78 }
  79
  80 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
  81 {
  82         if (pfk->dump.dump) {
  83                 if (pfk->dump.skb) {
  84                         kfree_skb(pfk->dump.skb);
  85                         pfk->dump.skb = NULL;
  86                 }
  87                 pfk->dump.done(pfk);
  88                 pfk->dump.dump = NULL;
  89                 pfk->dump.done = NULL;
  90         }
  91 }
  92
  93 static void pfkey_sock_destruct(struct sock *sk)
  94 {
  95         struct net *net = sock_net(sk);
  96         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  97
  98         pfkey_terminate_dump(pfkey_sk(sk));
  99         skb_queue_purge(&sk->sk_receive_queue);
 100
 101         if (!sock_flag(sk, SOCK_DEAD)) {
 102                 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
 103                 return;
 104         }
 105
 106         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 107         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 108
 109         atomic_dec(&net_pfkey->socks_nr);
 110 }
 111
 112 static const struct proto_ops pfkey_ops;
 113
 114 static void pfkey_insert(struct sock *sk)
 115 {
 116         struct net *net = sock_net(sk);
 117         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 118
 119         mutex_lock(&pfkey_mutex);
 120         sk_add_node_rcu(sk, &net_pfkey->table);
 121         mutex_unlock(&pfkey_mutex);
 122 }
 123
 124 static void pfkey_remove(struct sock *sk)
 125 {
 126         mutex_lock(&pfkey_mutex);
 127         sk_del_node_init_rcu(sk);
 128         mutex_unlock(&pfkey_mutex);
 129 }
 130
 131 static struct proto key_proto = {
 132         .name     = "KEY",
 133         .owner    = THIS_MODULE,
 134         .obj_size = sizeof(struct pfkey_sock),
 135 };
 136
 137 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
 138                         int kern)
 139 {
 140         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 141         struct sock *sk;
 142         int err;
 143
 144         if (!capable(CAP_NET_ADMIN))
 145                 return -EPERM;
 146         if (sock->type != SOCK_RAW)
 147                 return -ESOCKTNOSUPPORT;
 148         if (protocol != PF_KEY_V2)
 149                 return -EPROTONOSUPPORT;
 150
 151         err = -ENOMEM;
 152         sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
 153         if (sk == NULL)
 154                 goto out;
 155
 156         sock->ops = &pfkey_ops;
 157         sock_init_data(sock, sk);
 158
 159         sk->sk_family = PF_KEY;
 160         sk->sk_destruct = pfkey_sock_destruct;
 161
 162         atomic_inc(&net_pfkey->socks_nr);
 163
 164         pfkey_insert(sk);
 165
 166         return 0;
 167 out:
 168         return err;
 169 }
 170
 171 static int pfkey_release(struct socket *sock)
 172 {
 173         struct sock *sk = sock->sk;
 174
 175         if (!sk)
 176                 return 0;
 177
 178         pfkey_remove(sk);
 179
 180         sock_orphan(sk);
 181         sock->sk = NULL;
 182         skb_queue_purge(&sk->sk_write_queue);
 183
 184         synchronize_rcu();
 185         sock_put(sk);
 186
 187         return 0;
 188 }
 189
 190 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
 191                                gfp_t allocation, struct sock *sk)
 192 {
 193         int err = -ENOBUFS;
 194
 195         sock_hold(sk);
 196         if (*skb2 == NULL) {
 197                 if (atomic_read(&skb->users) != 1) {
 198                         *skb2 = skb_clone(skb, allocation);
 199                 } else {
 200                         *skb2 = skb;
 201                         atomic_inc(&skb->users);
 202                 }
 203         }
 204         if (*skb2 != NULL) {
 205                 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
 206                         skb_orphan(*skb2);
 207                         skb_set_owner_r(*skb2, sk);
 208                         skb_queue_tail(&sk->sk_receive_queue, *skb2);
 209                         sk->sk_data_ready(sk, (*skb2)->len);
 210                         *skb2 = NULL;
 211                         err = 0;
 212                 }
 213         }
 214         sock_put(sk);
 215         return err;
 216 }
 217
 218 /* Send SKB to all pfkey sockets matching selected criteria.  */
 219 #define BROADCAST_ALL           0
 220 #define BROADCAST_ONE           1
 221 #define BROADCAST_REGISTERED    2
 222 #define BROADCAST_PROMISC_ONLY  4
 223 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 224                            int broadcast_flags, struct sock *one_sk,
 225                            struct net *net)
 226 {
 227         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 228         struct sock *sk;
 229         struct hlist_node *node;
 230         struct sk_buff *skb2 = NULL;
 231         int err = -ESRCH;
 232
 233         /* XXX Do we need something like netlink_overrun?  I think
 234          * XXX PF_KEY socket apps will not mind current behavior.
 235          */
 236         if (!skb)
 237                 return -ENOMEM;
 238
 239         rcu_read_lock();
 240         sk_for_each_rcu(sk, node, &net_pfkey->table) {
 241                 struct pfkey_sock *pfk = pfkey_sk(sk);
 242                 int err2;
 243
 244                 /* Yes, it means that if you are meant to receive this
 245                  * pfkey message you receive it twice as promiscuous
 246                  * socket.
 247                  */
 248                 if (pfk->promisc)
 249                         pfkey_broadcast_one(skb, &skb2, allocation, sk);
 250
 251                 /* the exact target will be processed later */
 252                 if (sk == one_sk)
 253                         continue;
 254                 if (broadcast_flags != BROADCAST_ALL) {
 255                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 256                                 continue;
 257                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 258                             !pfk->registered)
 259                                 continue;
 260                         if (broadcast_flags & BROADCAST_ONE)
 261                                 continue;
 262                 }
 263
 264                 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
 265
 266                 /* Error is cleare after succecful sending to at least one
 267                  * registered KM */
 268                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 269                         err = err2;
 270         }
 271         rcu_read_unlock();
 272
 273         if (one_sk != NULL)
 274                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
 275
 276         kfree_skb(skb2);
 277         kfree_skb(skb);
 278         return err;
 279 }
 280
 281 static int pfkey_do_dump(struct pfkey_sock *pfk)
 282 {
 283         struct sadb_msg *hdr;
 284         int rc;
 285
 286         rc = pfk->dump.dump(pfk);
 287         if (rc == -ENOBUFS)
 288                 return 0;
 289
 290         if (pfk->dump.skb) {
 291                 if (!pfkey_can_dump(&pfk->sk))
 292                         return 0;
 293
 294                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
 295                 hdr->sadb_msg_seq = 0;
 296                 hdr->sadb_msg_errno = rc;
 297                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
 298                                 &pfk->sk, sock_net(&pfk->sk));
 299                 pfk->dump.skb = NULL;
 300         }
 301
 302         pfkey_terminate_dump(pfk);
 303         return rc;
 304 }
 305
 306 static inline void pfkey_hdr_dup(struct sadb_msg *new,
 307                                  const struct sadb_msg *orig)
 308 {
 309         *new = *orig;
 310 }
 311
 312 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
 313 {
 314         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 315         struct sadb_msg *hdr;
 316
 317         if (!skb)
 318                 return -ENOBUFS;
 319
 320         /* Woe be to the platform trying to support PFKEY yet
 321          * having normal errnos outside the 1-255 range, inclusive.
 322          */
 323         err = -err;
 324         if (err == ERESTARTSYS ||
 325             err == ERESTARTNOHAND ||
 326             err == ERESTARTNOINTR)
 327                 err = EINTR;
 328         if (err >= 512)
 329                 err = EINVAL;
 330         BUG_ON(err <= 0 || err >= 256);
 331
 332         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 333         pfkey_hdr_dup(hdr, orig);
 334         hdr->sadb_msg_errno = (uint8_t) err;
 335         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 336                              sizeof(uint64_t));
 337
 338         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
 339
 340         return 0;
 341 }
 342
 343 static u8 sadb_ext_min_len[] = {
 344         [SADB_EXT_RESERVED]             = (u8) 0,
 345         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 346         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 347         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 348         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 349         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 350         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 351         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 352         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 353         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 354         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 355         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 356         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 357         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 358         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 359         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 360         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 361         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 362         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 363         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 364         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 365         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 366         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 367         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 368         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 369         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
 370 };
 371
 372 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 373 static int verify_address_len(const void *p)
 374 {
 375         const struct sadb_address *sp = p;
 376         const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
 377         const struct sockaddr_in *sin;
 378 #if IS_ENABLED(CONFIG_IPV6)
 379         const struct sockaddr_in6 *sin6;
 380 #endif
 381         int len;
 382
 383         switch (addr->sa_family) {
 384         case AF_INET:
 385                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 386                 if (sp->sadb_address_len != len ||
 387                     sp->sadb_address_prefixlen > 32)
 388                         return -EINVAL;
 389                 break;
 390 #if IS_ENABLED(CONFIG_IPV6)
 391         case AF_INET6:
 392                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 393                 if (sp->sadb_address_len != len ||
 394                     sp->sadb_address_prefixlen > 128)
 395                         return -EINVAL;
 396                 break;
 397 #endif
 398         default:
 399                 /* It is user using kernel to keep track of security
 400                  * associations for another protocol, such as
 401                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 402                  * lengths.
 403                  *
 404                  * XXX Actually, association/policy database is not yet
 405                  * XXX able to cope with arbitrary sockaddr families.
 406                  * XXX When it can, remove this -EINVAL.  -DaveM
 407                  */
 408                 return -EINVAL;
 409                 break;
 410         }
 411
 412         return 0;
 413 }
 414
 415 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
 416 {
 417         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 418                             sec_ctx->sadb_x_ctx_len,
 419                             sizeof(uint64_t));
 420 }
 421
 422 static inline int verify_sec_ctx_len(const void *p)
 423 {
 424         const struct sadb_x_sec_ctx *sec_ctx = p;
 425         int len = sec_ctx->sadb_x_ctx_len;
 426
 427         if (len > PAGE_SIZE)
 428                 return -EINVAL;
 429
 430         len = pfkey_sec_ctx_len(sec_ctx);
 431
 432         if (sec_ctx->sadb_x_sec_len != len)
 433                 return -EINVAL;
 434
 435         return 0;
 436 }
 437
 438 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx)
 439 {
 440         struct xfrm_user_sec_ctx *uctx = NULL;
 441         int ctx_size = sec_ctx->sadb_x_ctx_len;
 442
 443         uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
 444
 445         if (!uctx)
 446                 return NULL;
 447
 448         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 449         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 450         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 451         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 452         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 453         memcpy(uctx + 1, sec_ctx + 1,
 454                uctx->ctx_len);
 455
 456         return uctx;
 457 }
 458
 459 static int present_and_same_family(const struct sadb_address *src,
 460                                    const struct sadb_address *dst)
 461 {
 462         const struct sockaddr *s_addr, *d_addr;
 463
 464         if (!src || !dst)
 465                 return 0;
 466
 467         s_addr = (const struct sockaddr *)(src + 1);
 468         d_addr = (const struct sockaddr *)(dst + 1);
 469         if (s_addr->sa_family != d_addr->sa_family)
 470                 return 0;
 471         if (s_addr->sa_family != AF_INET
 472 #if IS_ENABLED(CONFIG_IPV6)
 473             && s_addr->sa_family != AF_INET6
 474 #endif
 475                 )
 476                 return 0;
 477
 478         return 1;
 479 }
 480
 481 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
 482 {
 483         const char *p = (char *) hdr;
 484         int len = skb->len;
 485
 486         len -= sizeof(*hdr);
 487         p += sizeof(*hdr);
 488         while (len > 0) {
 489                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
 490                 uint16_t ext_type;
 491                 int ext_len;
 492
 493                 ext_len  = ehdr->sadb_ext_len;
 494                 ext_len *= sizeof(uint64_t);
 495                 ext_type = ehdr->sadb_ext_type;
 496                 if (ext_len < sizeof(uint64_t) ||
 497                     ext_len > len ||
 498                     ext_type == SADB_EXT_RESERVED)
 499                         return -EINVAL;
 500
 501                 if (ext_type <= SADB_EXT_MAX) {
 502                         int min = (int) sadb_ext_min_len[ext_type];
 503                         if (ext_len < min)
 504                                 return -EINVAL;
 505                         if (ext_hdrs[ext_type-1] != NULL)
 506                                 return -EINVAL;
 507                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 508                             ext_type == SADB_EXT_ADDRESS_DST ||
 509                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 510                             ext_type == SADB_X_EXT_NAT_T_OA) {
 511                                 if (verify_address_len(p))
 512                                         return -EINVAL;
 513                         }
 514                         if (ext_type == SADB_X_EXT_SEC_CTX) {
 515                                 if (verify_sec_ctx_len(p))
 516                                         return -EINVAL;
 517                         }
 518                         ext_hdrs[ext_type-1] = (void *) p;
 519                 }
 520                 p   += ext_len;
 521                 len -= ext_len;
 522         }
 523
 524         return 0;
 525 }
 526
 527 static uint16_t
 528 pfkey_satype2proto(uint8_t satype)
 529 {
 530         switch (satype) {
 531         case SADB_SATYPE_UNSPEC:
 532                 return IPSEC_PROTO_ANY;
 533         case SADB_SATYPE_AH:
 534                 return IPPROTO_AH;
 535         case SADB_SATYPE_ESP:
 536                 return IPPROTO_ESP;
 537         case SADB_X_SATYPE_IPCOMP:
 538                 return IPPROTO_COMP;
 539                 break;
 540         default:
 541                 return 0;
 542         }
 543         /* NOTREACHED */
 544 }
 545
 546 static uint8_t
 547 pfkey_proto2satype(uint16_t proto)
 548 {
 549         switch (proto) {
 550         case IPPROTO_AH:
 551                 return SADB_SATYPE_AH;
 552         case IPPROTO_ESP:
 553                 return SADB_SATYPE_ESP;
 554         case IPPROTO_COMP:
 555                 return SADB_X_SATYPE_IPCOMP;
 556                 break;
 557         default:
 558                 return 0;
 559         }
 560         /* NOTREACHED */
 561 }
 562
 563 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 564  * say specifically 'just raw sockets' as we encode them as 255.
 565  */
 566
 567 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 568 {
 569         return proto == IPSEC_PROTO_ANY ? 0 : proto;
 570 }
 571
 572 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 573 {
 574         return proto ? proto : IPSEC_PROTO_ANY;
 575 }
 576
 577 static inline int pfkey_sockaddr_len(sa_family_t family)
 578 {
 579         switch (family) {
 580         case AF_INET:
 581                 return sizeof(struct sockaddr_in);
 582 #if IS_ENABLED(CONFIG_IPV6)
 583         case AF_INET6:
 584                 return sizeof(struct sockaddr_in6);
 585 #endif
 586         }
 587         return 0;
 588 }
 589
 590 static
 591 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 592 {
 593         switch (sa->sa_family) {
 594         case AF_INET:
 595                 xaddr->a4 =
 596                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 597                 return AF_INET;
 598 #if IS_ENABLED(CONFIG_IPV6)
 599         case AF_INET6:
 600                 memcpy(xaddr->a6,
 601                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 602                        sizeof(struct in6_addr));
 603                 return AF_INET6;
 604 #endif
 605         }
 606         return 0;
 607 }
 608
 609 static
 610 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
 611 {
 612         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 613                                       xaddr);
 614 }
 615
 616 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
 617 {
 618         const struct sadb_sa *sa;
 619         const struct sadb_address *addr;
 620         uint16_t proto;
 621         unsigned short family;
 622         xfrm_address_t *xaddr;
 623
 624         sa = ext_hdrs[SADB_EXT_SA - 1];
 625         if (sa == NULL)
 626                 return NULL;
 627
 628         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 629         if (proto == 0)
 630                 return NULL;
 631
 632         /* sadb_address_len should be checked by caller */
 633         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
 634         if (addr == NULL)
 635                 return NULL;
 636
 637         family = ((const struct sockaddr *)(addr + 1))->sa_family;
 638         switch (family) {
 639         case AF_INET:
 640                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
 641                 break;
 642 #if IS_ENABLED(CONFIG_IPV6)
 643         case AF_INET6:
 644                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 645                 break;
 646 #endif
 647         default:
 648                 xaddr = NULL;
 649         }
 650
 651         if (!xaddr)
 652                 return NULL;
 653
 654         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
 655 }
 656
 657 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 658
 659 static int
 660 pfkey_sockaddr_size(sa_family_t family)
 661 {
 662         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 663 }
 664
 665 static inline int pfkey_mode_from_xfrm(int mode)
 666 {
 667         switch(mode) {
 668         case XFRM_MODE_TRANSPORT:
 669                 return IPSEC_MODE_TRANSPORT;
 670         case XFRM_MODE_TUNNEL:
 671                 return IPSEC_MODE_TUNNEL;
 672         case XFRM_MODE_BEET:
 673                 return IPSEC_MODE_BEET;
 674         default:
 675                 return -1;
 676         }
 677 }
 678
 679 static inline int pfkey_mode_to_xfrm(int mode)
 680 {
 681         switch(mode) {
 682         case IPSEC_MODE_ANY:    /*XXX*/
 683         case IPSEC_MODE_TRANSPORT:
 684                 return XFRM_MODE_TRANSPORT;
 685         case IPSEC_MODE_TUNNEL:
 686                 return XFRM_MODE_TUNNEL;
 687         case IPSEC_MODE_BEET:
 688                 return XFRM_MODE_BEET;
 689         default:
 690                 return -1;
 691         }
 692 }
 693
 694 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
 695                                         struct sockaddr *sa,
 696                                         unsigned short family)
 697 {
 698         switch (family) {
 699         case AF_INET:
 700             {
 701                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 702                 sin->sin_family = AF_INET;
 703                 sin->sin_port = port;
 704                 sin->sin_addr.s_addr = xaddr->a4;
 705                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 706                 return 32;
 707             }
 708 #if IS_ENABLED(CONFIG_IPV6)
 709         case AF_INET6:
 710             {
 711                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 712                 sin6->sin6_family = AF_INET6;
 713                 sin6->sin6_port = port;
 714                 sin6->sin6_flowinfo = 0;
 715                 sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
 716                 sin6->sin6_scope_id = 0;
 717                 return 128;
 718             }
 719 #endif
 720         }
 721         return 0;
 722 }
 723
 724 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
 725                                               int add_keys, int hsc)
 726 {
 727         struct sk_buff *skb;
 728         struct sadb_msg *hdr;
 729         struct sadb_sa *sa;
 730         struct sadb_lifetime *lifetime;
 731         struct sadb_address *addr;
 732         struct sadb_key *key;
 733         struct sadb_x_sa2 *sa2;
 734         struct sadb_x_sec_ctx *sec_ctx;
 735         struct xfrm_sec_ctx *xfrm_ctx;
 736         int ctx_size = 0;
 737         int size;
 738         int auth_key_size = 0;
 739         int encrypt_key_size = 0;
 740         int sockaddr_size;
 741         struct xfrm_encap_tmpl *natt = NULL;
 742         int mode;
 743
 744         /* address family check */
 745         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 746         if (!sockaddr_size)
 747                 return ERR_PTR(-EINVAL);
 748
 749         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 750            key(AE), (identity(SD),) (sensitivity)> */
 751         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 752                 sizeof(struct sadb_lifetime) +
 753                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 754                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 755                         sizeof(struct sadb_address)*2 +
 756                                 sockaddr_size*2 +
 757                                         sizeof(struct sadb_x_sa2);
 758
 759         if ((xfrm_ctx = x->security)) {
 760                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 761                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 762         }
 763
 764         /* identity & sensitivity */
 765         if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr, x->props.family))
 766                 size += sizeof(struct sadb_address) + sockaddr_size;
 767
 768         if (add_keys) {
 769                 if (x->aalg && x->aalg->alg_key_len) {
 770                         auth_key_size =
 771                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 772                         size += sizeof(struct sadb_key) + auth_key_size;
 773                 }
 774                 if (x->ealg && x->ealg->alg_key_len) {
 775                         encrypt_key_size =
 776                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 777                         size += sizeof(struct sadb_key) + encrypt_key_size;
 778                 }
 779         }
 780         if (x->encap)
 781                 natt = x->encap;
 782
 783         if (natt && natt->encap_type) {
 784                 size += sizeof(struct sadb_x_nat_t_type);
 785                 size += sizeof(struct sadb_x_nat_t_port);
 786                 size += sizeof(struct sadb_x_nat_t_port);
 787         }
 788
 789         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 790         if (skb == NULL)
 791                 return ERR_PTR(-ENOBUFS);
 792
 793         /* call should fill header later */
 794         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 795         memset(hdr, 0, size);   /* XXX do we need this ? */
 796         hdr->sadb_msg_len = size / sizeof(uint64_t);
 797
 798         /* sa */
 799         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 800         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 801         sa->sadb_sa_exttype = SADB_EXT_SA;
 802         sa->sadb_sa_spi = x->id.spi;
 803         sa->sadb_sa_replay = x->props.replay_window;
 804         switch (x->km.state) {
 805         case XFRM_STATE_VALID:
 806                 sa->sadb_sa_state = x->km.dying ?
 807                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 808                 break;
 809         case XFRM_STATE_ACQ:
 810                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 811                 break;
 812         default:
 813                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 814                 break;
 815         }
 816         sa->sadb_sa_auth = 0;
 817         if (x->aalg) {
 818                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 819                 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
 820         }
 821         sa->sadb_sa_encrypt = 0;
 822         BUG_ON(x->ealg && x->calg);
 823         if (x->ealg) {
 824                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 825                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 826         }
 827         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 828         if (x->calg) {
 829                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 830                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 831         }
 832
 833         sa->sadb_sa_flags = 0;
 834         if (x->props.flags & XFRM_STATE_NOECN)
 835                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 836         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 837                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 838         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 839                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 840
 841         /* hard time */
 842         if (hsc & 2) {
 843                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 844                                                              sizeof(struct sadb_lifetime));
 845                 lifetime->sadb_lifetime_len =
 846                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 847                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 848                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 849                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 850                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 851                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 852         }
 853         /* soft time */
 854         if (hsc & 1) {
 855                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 856                                                              sizeof(struct sadb_lifetime));
 857                 lifetime->sadb_lifetime_len =
 858                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 859                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 860                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 861                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 862                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 863                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 864         }
 865         /* current time */
 866         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 867                                                      sizeof(struct sadb_lifetime));
 868         lifetime->sadb_lifetime_len =
 869                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 870         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 871         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 872         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 873         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 874         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 875         /* src address */
 876         addr = (struct sadb_address*) skb_put(skb,
 877                                               sizeof(struct sadb_address)+sockaddr_size);
 878         addr->sadb_address_len =
 879                 (sizeof(struct sadb_address)+sockaddr_size)/
 880                         sizeof(uint64_t);
 881         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 882         /* "if the ports are non-zero, then the sadb_address_proto field,
 883            normally zero, MUST be filled in with the transport
 884            protocol's number." - RFC2367 */
 885         addr->sadb_address_proto = 0;
 886         addr->sadb_address_reserved = 0;
 887
 888         addr->sadb_address_prefixlen =
 889                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 890                                     (struct sockaddr *) (addr + 1),
 891                                     x->props.family);
 892         if (!addr->sadb_address_prefixlen)
 893                 BUG();
 894
 895         /* dst address */
 896         addr = (struct sadb_address*) skb_put(skb,
 897                                               sizeof(struct sadb_address)+sockaddr_size);
 898         addr->sadb_address_len =
 899                 (sizeof(struct sadb_address)+sockaddr_size)/
 900                         sizeof(uint64_t);
 901         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 902         addr->sadb_address_proto = 0;
 903         addr->sadb_address_reserved = 0;
 904
 905         addr->sadb_address_prefixlen =
 906                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 907                                     (struct sockaddr *) (addr + 1),
 908                                     x->props.family);
 909         if (!addr->sadb_address_prefixlen)
 910                 BUG();
 911
 912         if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr,
 913                           x->props.family)) {
 914                 addr = (struct sadb_address*) skb_put(skb,
 915                         sizeof(struct sadb_address)+sockaddr_size);
 916                 addr->sadb_address_len =
 917                         (sizeof(struct sadb_address)+sockaddr_size)/
 918                         sizeof(uint64_t);
 919                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 920                 addr->sadb_address_proto =
 921                         pfkey_proto_from_xfrm(x->sel.proto);
 922                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 923                 addr->sadb_address_reserved = 0;
 924
 925                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 926                                     (struct sockaddr *) (addr + 1),
 927                                     x->props.family);
 928         }
 929
 930         /* auth key */
 931         if (add_keys && auth_key_size) {
 932                 key = (struct sadb_key *) skb_put(skb,
 933                                                   sizeof(struct sadb_key)+auth_key_size);
 934                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 935                         sizeof(uint64_t);
 936                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 937                 key->sadb_key_bits = x->aalg->alg_key_len;
 938                 key->sadb_key_reserved = 0;
 939                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 940         }
 941         /* encrypt key */
 942         if (add_keys && encrypt_key_size) {
 943                 key = (struct sadb_key *) skb_put(skb,
 944                                                   sizeof(struct sadb_key)+encrypt_key_size);
 945                 key->sadb_key_len = (sizeof(struct sadb_key) +
 946                                      encrypt_key_size) / sizeof(uint64_t);
 947                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 948                 key->sadb_key_bits = x->ealg->alg_key_len;
 949                 key->sadb_key_reserved = 0;
 950                 memcpy(key + 1, x->ealg->alg_key,
 951                        (x->ealg->alg_key_len+7)/8);
 952         }
 953
 954         /* sa */
 955         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 956         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 957         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 958         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 959                 kfree_skb(skb);
 960                 return ERR_PTR(-EINVAL);
 961         }
 962         sa2->sadb_x_sa2_mode = mode;
 963         sa2->sadb_x_sa2_reserved1 = 0;
 964         sa2->sadb_x_sa2_reserved2 = 0;
 965         sa2->sadb_x_sa2_sequence = 0;
 966         sa2->sadb_x_sa2_reqid = x->props.reqid;
 967
 968         if (natt && natt->encap_type) {
 969                 struct sadb_x_nat_t_type *n_type;
 970                 struct sadb_x_nat_t_port *n_port;
 971
 972                 /* type */
 973                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
 974                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
 975                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
 976                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
 977                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
 978                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
 979                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
 980
 981                 /* source port */
 982                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 983                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 984                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
 985                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
 986                 n_port->sadb_x_nat_t_port_reserved = 0;
 987
 988                 /* dest port */
 989                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 990                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 991                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
 992                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
 993                 n_port->sadb_x_nat_t_port_reserved = 0;
 994         }
 995
 996         /* security context */
 997         if (xfrm_ctx) {
 998                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
 999                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1000                 sec_ctx->sadb_x_sec_len =
1001                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1002                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1003                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1004                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1005                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1006                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1007                        xfrm_ctx->ctx_len);
1008         }
1009
1010         return skb;
1011 }
1012
1013
1014 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1015 {
1016         struct sk_buff *skb;
1017
1018         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1019
1020         return skb;
1021 }
1022
1023 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1024                                                           int hsc)
1025 {
1026         return __pfkey_xfrm_state2msg(x, 0, hsc);
1027 }
1028
1029 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1030                                                 const struct sadb_msg *hdr,
1031                                                 void * const *ext_hdrs)
1032 {
1033         struct xfrm_state *x;
1034         const struct sadb_lifetime *lifetime;
1035         const struct sadb_sa *sa;
1036         const struct sadb_key *key;
1037         const struct sadb_x_sec_ctx *sec_ctx;
1038         uint16_t proto;
1039         int err;
1040
1041
1042         sa = ext_hdrs[SADB_EXT_SA - 1];
1043         if (!sa ||
1044             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1045                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1046                 return ERR_PTR(-EINVAL);
1047         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1048             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1049                 return ERR_PTR(-EINVAL);
1050         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1051             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1052                 return ERR_PTR(-EINVAL);
1053         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1054             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1055                 return ERR_PTR(-EINVAL);
1056
1057         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1058         if (proto == 0)
1059                 return ERR_PTR(-EINVAL);
1060
1061         /* default error is no buffer space */
1062         err = -ENOBUFS;
1063
1064         /* RFC2367:
1065
1066    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1067    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1068    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1069    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1070    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1071    not true.
1072
1073            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1074            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1075          */
1076         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1077             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1078              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1079             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1080                 return ERR_PTR(-EINVAL);
1081         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1082         if (key != NULL &&
1083             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1084             ((key->sadb_key_bits+7) / 8 == 0 ||
1085              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1086                 return ERR_PTR(-EINVAL);
1087         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1088         if (key != NULL &&
1089             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1090             ((key->sadb_key_bits+7) / 8 == 0 ||
1091              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1092                 return ERR_PTR(-EINVAL);
1093
1094         x = xfrm_state_alloc(net);
1095         if (x == NULL)
1096                 return ERR_PTR(-ENOBUFS);
1097
1098         x->id.proto = proto;
1099         x->id.spi = sa->sadb_sa_spi;
1100         x->props.replay_window = sa->sadb_sa_replay;
1101         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1102                 x->props.flags |= XFRM_STATE_NOECN;
1103         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1104                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1105         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1106                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1107
1108         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1109         if (lifetime != NULL) {
1110                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1111                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1112                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1113                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1114         }
1115         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1116         if (lifetime != NULL) {
1117                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1118                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1119                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1120                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1121         }
1122
1123         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1124         if (sec_ctx != NULL) {
1125                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1126
1127                 if (!uctx)
1128                         goto out;
1129
1130                 err = security_xfrm_state_alloc(x, uctx);
1131                 kfree(uctx);
1132
1133                 if (err)
1134                         goto out;
1135         }
1136
1137         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1138         if (sa->sadb_sa_auth) {
1139                 int keysize = 0;
1140                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1141                 if (!a) {
1142                         err = -ENOSYS;
1143                         goto out;
1144                 }
1145                 if (key)
1146                         keysize = (key->sadb_key_bits + 7) / 8;
1147                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1148                 if (!x->aalg)
1149                         goto out;
1150                 strcpy(x->aalg->alg_name, a->name);
1151                 x->aalg->alg_key_len = 0;
1152                 if (key) {
1153                         x->aalg->alg_key_len = key->sadb_key_bits;
1154                         memcpy(x->aalg->alg_key, key+1, keysize);
1155                 }
1156                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1157                 x->props.aalgo = sa->sadb_sa_auth;
1158                 /* x->algo.flags = sa->sadb_sa_flags; */
1159         }
1160         if (sa->sadb_sa_encrypt) {
1161                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1162                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1163                         if (!a) {
1164                                 err = -ENOSYS;
1165                                 goto out;
1166                         }
1167                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1168                         if (!x->calg)
1169                                 goto out;
1170                         strcpy(x->calg->alg_name, a->name);
1171                         x->props.calgo = sa->sadb_sa_encrypt;
1172                 } else {
1173                         int keysize = 0;
1174                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1175                         if (!a) {
1176                                 err = -ENOSYS;
1177                                 goto out;
1178                         }
1179                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1180                         if (key)
1181                                 keysize = (key->sadb_key_bits + 7) / 8;
1182                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1183                         if (!x->ealg)
1184                                 goto out;
1185                         strcpy(x->ealg->alg_name, a->name);
1186                         x->ealg->alg_key_len = 0;
1187                         if (key) {
1188                                 x->ealg->alg_key_len = key->sadb_key_bits;
1189                                 memcpy(x->ealg->alg_key, key+1, keysize);
1190                         }
1191                         x->props.ealgo = sa->sadb_sa_encrypt;
1192                 }
1193         }
1194         /* x->algo.flags = sa->sadb_sa_flags; */
1195
1196         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1197                                                     &x->props.saddr);
1198         if (!x->props.family) {
1199                 err = -EAFNOSUPPORT;
1200                 goto out;
1201         }
1202         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1203                                   &x->id.daddr);
1204
1205         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1206                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1207                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1208                 if (mode < 0) {
1209                         err = -EINVAL;
1210                         goto out;
1211                 }
1212                 x->props.mode = mode;
1213                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1214         }
1215
1216         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1217                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1218
1219                 /* Nobody uses this, but we try. */
1220                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1221                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1222         }
1223
1224         if (!x->sel.family)
1225                 x->sel.family = x->props.family;
1226
1227         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1228                 const struct sadb_x_nat_t_type* n_type;
1229                 struct xfrm_encap_tmpl *natt;
1230
1231                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1232                 if (!x->encap)
1233                         goto out;
1234
1235                 natt = x->encap;
1236                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1237                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1238
1239                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1240                         const struct sadb_x_nat_t_port *n_port =
1241                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1242                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1243                 }
1244                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1245                         const struct sadb_x_nat_t_port *n_port =
1246                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1247                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1248                 }
1249                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1250         }
1251
1252         err = xfrm_init_state(x);
1253         if (err)
1254                 goto out;
1255
1256         x->km.seq = hdr->sadb_msg_seq;
1257         return x;
1258
1259 out:
1260         x->km.state = XFRM_STATE_DEAD;
1261         xfrm_state_put(x);
1262         return ERR_PTR(err);
1263 }
1264
1265 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1266 {
1267         return -EOPNOTSUPP;
1268 }
1269
1270 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1271 {
1272         struct net *net = sock_net(sk);
1273         struct sk_buff *resp_skb;
1274         struct sadb_x_sa2 *sa2;
1275         struct sadb_address *saddr, *daddr;
1276         struct sadb_msg *out_hdr;
1277         struct sadb_spirange *range;
1278         struct xfrm_state *x = NULL;
1279         int mode;
1280         int err;
1281         u32 min_spi, max_spi;
1282         u32 reqid;
1283         u8 proto;
1284         unsigned short family;
1285         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1286
1287         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1288                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1289                 return -EINVAL;
1290
1291         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1292         if (proto == 0)
1293                 return -EINVAL;
1294
1295         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1296                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1297                 if (mode < 0)
1298                         return -EINVAL;
1299                 reqid = sa2->sadb_x_sa2_reqid;
1300         } else {
1301                 mode = 0;
1302                 reqid = 0;
1303         }
1304
1305         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1306         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1307
1308         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1309         switch (family) {
1310         case AF_INET:
1311                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1312                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1313                 break;
1314 #if IS_ENABLED(CONFIG_IPV6)
1315         case AF_INET6:
1316                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1317                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1318                 break;
1319 #endif
1320         }
1321
1322         if (hdr->sadb_msg_seq) {
1323                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1324                 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1325                         xfrm_state_put(x);
1326                         x = NULL;
1327                 }
1328         }
1329
1330         if (!x)
1331                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1332
1333         if (x == NULL)
1334                 return -ENOENT;
1335
1336         min_spi = 0x100;
1337         max_spi = 0x0fffffff;
1338
1339         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1340         if (range) {
1341                 min_spi = range->sadb_spirange_min;
1342                 max_spi = range->sadb_spirange_max;
1343         }
1344
1345         err = xfrm_alloc_spi(x, min_spi, max_spi);
1346         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1347
1348         if (IS_ERR(resp_skb)) {
1349                 xfrm_state_put(x);
1350                 return  PTR_ERR(resp_skb);
1351         }
1352
1353         out_hdr = (struct sadb_msg *) resp_skb->data;
1354         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1355         out_hdr->sadb_msg_type = SADB_GETSPI;
1356         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1357         out_hdr->sadb_msg_errno = 0;
1358         out_hdr->sadb_msg_reserved = 0;
1359         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1360         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1361
1362         xfrm_state_put(x);
1363
1364         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1365
1366         return 0;
1367 }
1368
1369 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1370 {
1371         struct net *net = sock_net(sk);
1372         struct xfrm_state *x;
1373
1374         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1375                 return -EOPNOTSUPP;
1376
1377         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1378                 return 0;
1379
1380         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1381         if (x == NULL)
1382                 return 0;
1383
1384         spin_lock_bh(&x->lock);
1385         if (x->km.state == XFRM_STATE_ACQ) {
1386                 x->km.state = XFRM_STATE_ERROR;
1387                 wake_up(&net->xfrm.km_waitq);
1388         }
1389         spin_unlock_bh(&x->lock);
1390         xfrm_state_put(x);
1391         return 0;
1392 }
1393
1394 static inline int event2poltype(int event)
1395 {
1396         switch (event) {
1397         case XFRM_MSG_DELPOLICY:
1398                 return SADB_X_SPDDELETE;
1399         case XFRM_MSG_NEWPOLICY:
1400                 return SADB_X_SPDADD;
1401         case XFRM_MSG_UPDPOLICY:
1402                 return SADB_X_SPDUPDATE;
1403         case XFRM_MSG_POLEXPIRE:
1404         //      return SADB_X_SPDEXPIRE;
1405         default:
1406                 pr_err("pfkey: Unknown policy event %d\n", event);
1407                 break;
1408         }
1409
1410         return 0;
1411 }
1412
1413 static inline int event2keytype(int event)
1414 {
1415         switch (event) {
1416         case XFRM_MSG_DELSA:
1417                 return SADB_DELETE;
1418         case XFRM_MSG_NEWSA:
1419                 return SADB_ADD;
1420         case XFRM_MSG_UPDSA:
1421                 return SADB_UPDATE;
1422         case XFRM_MSG_EXPIRE:
1423                 return SADB_EXPIRE;
1424         default:
1425                 pr_err("pfkey: Unknown SA event %d\n", event);
1426                 break;
1427         }
1428
1429         return 0;
1430 }
1431
1432 /* ADD/UPD/DEL */
1433 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1434 {
1435         struct sk_buff *skb;
1436         struct sadb_msg *hdr;
1437
1438         skb = pfkey_xfrm_state2msg(x);
1439
1440         if (IS_ERR(skb))
1441                 return PTR_ERR(skb);
1442
1443         hdr = (struct sadb_msg *) skb->data;
1444         hdr->sadb_msg_version = PF_KEY_V2;
1445         hdr->sadb_msg_type = event2keytype(c->event);
1446         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1447         hdr->sadb_msg_errno = 0;
1448         hdr->sadb_msg_reserved = 0;
1449         hdr->sadb_msg_seq = c->seq;
1450         hdr->sadb_msg_pid = c->portid;
1451
1452         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1453
1454         return 0;
1455 }
1456
1457 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1458 {
1459         struct net *net = sock_net(sk);
1460         struct xfrm_state *x;
1461         int err;
1462         struct km_event c;
1463
1464         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1465         if (IS_ERR(x))
1466                 return PTR_ERR(x);
1467
1468         xfrm_state_hold(x);
1469         if (hdr->sadb_msg_type == SADB_ADD)
1470                 err = xfrm_state_add(x);
1471         else
1472                 err = xfrm_state_update(x);
1473
1474         xfrm_audit_state_add(x, err ? 0 : 1,
1475                              audit_get_loginuid(current),
1476                              audit_get_sessionid(current), 0);
1477
1478         if (err < 0) {
1479                 x->km.state = XFRM_STATE_DEAD;
1480                 __xfrm_state_put(x);
1481                 goto out;
1482         }
1483
1484         if (hdr->sadb_msg_type == SADB_ADD)
1485                 c.event = XFRM_MSG_NEWSA;
1486         else
1487                 c.event = XFRM_MSG_UPDSA;
1488         c.seq = hdr->sadb_msg_seq;
1489         c.portid = hdr->sadb_msg_pid;
1490         km_state_notify(x, &c);
1491 out:
1492         xfrm_state_put(x);
1493         return err;
1494 }
1495
1496 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1497 {
1498         struct net *net = sock_net(sk);
1499         struct xfrm_state *x;
1500         struct km_event c;
1501         int err;
1502
1503         if (!ext_hdrs[SADB_EXT_SA-1] ||
1504             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1505                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1506                 return -EINVAL;
1507
1508         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1509         if (x == NULL)
1510                 return -ESRCH;
1511
1512         if ((err = security_xfrm_state_delete(x)))
1513                 goto out;
1514
1515         if (xfrm_state_kern(x)) {
1516                 err = -EPERM;
1517                 goto out;
1518         }
1519
1520         err = xfrm_state_delete(x);
1521
1522         if (err < 0)
1523                 goto out;
1524
1525         c.seq = hdr->sadb_msg_seq;
1526         c.portid = hdr->sadb_msg_pid;
1527         c.event = XFRM_MSG_DELSA;
1528         km_state_notify(x, &c);
1529 out:
1530         xfrm_audit_state_delete(x, err ? 0 : 1,
1531                                 audit_get_loginuid(current),
1532                                 audit_get_sessionid(current), 0);
1533         xfrm_state_put(x);
1534
1535         return err;
1536 }
1537
1538 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1539 {
1540         struct net *net = sock_net(sk);
1541         __u8 proto;
1542         struct sk_buff *out_skb;
1543         struct sadb_msg *out_hdr;
1544         struct xfrm_state *x;
1545
1546         if (!ext_hdrs[SADB_EXT_SA-1] ||
1547             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1548                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1549                 return -EINVAL;
1550
1551         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1552         if (x == NULL)
1553                 return -ESRCH;
1554
1555         out_skb = pfkey_xfrm_state2msg(x);
1556         proto = x->id.proto;
1557         xfrm_state_put(x);
1558         if (IS_ERR(out_skb))
1559                 return  PTR_ERR(out_skb);
1560
1561         out_hdr = (struct sadb_msg *) out_skb->data;
1562         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1563         out_hdr->sadb_msg_type = SADB_GET;
1564         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1565         out_hdr->sadb_msg_errno = 0;
1566         out_hdr->sadb_msg_reserved = 0;
1567         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1568         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1569         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1570
1571         return 0;
1572 }
1573
1574 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1575                                               gfp_t allocation)
1576 {
1577         struct sk_buff *skb;
1578         struct sadb_msg *hdr;
1579         int len, auth_len, enc_len, i;
1580
1581         auth_len = xfrm_count_auth_supported();
1582         if (auth_len) {
1583                 auth_len *= sizeof(struct sadb_alg);
1584                 auth_len += sizeof(struct sadb_supported);
1585         }
1586
1587         enc_len = xfrm_count_enc_supported();
1588         if (enc_len) {
1589                 enc_len *= sizeof(struct sadb_alg);
1590                 enc_len += sizeof(struct sadb_supported);
1591         }
1592
1593         len = enc_len + auth_len + sizeof(struct sadb_msg);
1594
1595         skb = alloc_skb(len + 16, allocation);
1596         if (!skb)
1597                 goto out_put_algs;
1598
1599         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1600         pfkey_hdr_dup(hdr, orig);
1601         hdr->sadb_msg_errno = 0;
1602         hdr->sadb_msg_len = len / sizeof(uint64_t);
1603
1604         if (auth_len) {
1605                 struct sadb_supported *sp;
1606                 struct sadb_alg *ap;
1607
1608                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1609                 ap = (struct sadb_alg *) (sp + 1);
1610
1611                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1612                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1613
1614                 for (i = 0; ; i++) {
1615                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1616                         if (!aalg)
1617                                 break;
1618                         if (aalg->available)
1619                                 *ap++ = aalg->desc;
1620                 }
1621         }
1622
1623         if (enc_len) {
1624                 struct sadb_supported *sp;
1625                 struct sadb_alg *ap;
1626
1627                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1628                 ap = (struct sadb_alg *) (sp + 1);
1629
1630                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1631                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1632
1633                 for (i = 0; ; i++) {
1634                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1635                         if (!ealg)
1636                                 break;
1637                         if (ealg->available)
1638                                 *ap++ = ealg->desc;
1639                 }
1640         }
1641
1642 out_put_algs:
1643         return skb;
1644 }
1645
1646 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1647 {
1648         struct pfkey_sock *pfk = pfkey_sk(sk);
1649         struct sk_buff *supp_skb;
1650
1651         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1652                 return -EINVAL;
1653
1654         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1655                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1656                         return -EEXIST;
1657                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1658         }
1659
1660         xfrm_probe_algs();
1661
1662         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1663         if (!supp_skb) {
1664                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1665                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1666
1667                 return -ENOBUFS;
1668         }
1669
1670         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1671
1672         return 0;
1673 }
1674
1675 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1676 {
1677         struct sk_buff *skb;
1678         struct sadb_msg *hdr;
1679
1680         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1681         if (!skb)
1682                 return -ENOBUFS;
1683
1684         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1685         memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1686         hdr->sadb_msg_errno = (uint8_t) 0;
1687         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1688
1689         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1690 }
1691
1692 static int key_notify_sa_flush(const struct km_event *c)
1693 {
1694         struct sk_buff *skb;
1695         struct sadb_msg *hdr;
1696
1697         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1698         if (!skb)
1699                 return -ENOBUFS;
1700         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1701         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1702         hdr->sadb_msg_type = SADB_FLUSH;
1703         hdr->sadb_msg_seq = c->seq;
1704         hdr->sadb_msg_pid = c->portid;
1705         hdr->sadb_msg_version = PF_KEY_V2;
1706         hdr->sadb_msg_errno = (uint8_t) 0;
1707         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1708
1709         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1710
1711         return 0;
1712 }
1713
1714 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1715 {
1716         struct net *net = sock_net(sk);
1717         unsigned int proto;
1718         struct km_event c;
1719         struct xfrm_audit audit_info;
1720         int err, err2;
1721
1722         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1723         if (proto == 0)
1724                 return -EINVAL;
1725
1726         audit_info.loginuid = audit_get_loginuid(current);
1727         audit_info.sessionid = audit_get_sessionid(current);
1728         audit_info.secid = 0;
1729         err = xfrm_state_flush(net, proto, &audit_info);
1730         err2 = unicast_flush_resp(sk, hdr);
1731         if (err || err2) {
1732                 if (err == -ESRCH) /* empty table - go quietly */
1733                         err = 0;
1734                 return err ? err : err2;
1735         }
1736
1737         c.data.proto = proto;
1738         c.seq = hdr->sadb_msg_seq;
1739         c.portid = hdr->sadb_msg_pid;
1740         c.event = XFRM_MSG_FLUSHSA;
1741         c.net = net;
1742         km_state_notify(NULL, &c);
1743
1744         return 0;
1745 }
1746
1747 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1748 {
1749         struct pfkey_sock *pfk = ptr;
1750         struct sk_buff *out_skb;
1751         struct sadb_msg *out_hdr;
1752
1753         if (!pfkey_can_dump(&pfk->sk))
1754                 return -ENOBUFS;
1755
1756         out_skb = pfkey_xfrm_state2msg(x);
1757         if (IS_ERR(out_skb))
1758                 return PTR_ERR(out_skb);
1759
1760         out_hdr = (struct sadb_msg *) out_skb->data;
1761         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1762         out_hdr->sadb_msg_type = SADB_DUMP;
1763         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1764         out_hdr->sadb_msg_errno = 0;
1765         out_hdr->sadb_msg_reserved = 0;
1766         out_hdr->sadb_msg_seq = count + 1;
1767         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1768
1769         if (pfk->dump.skb)
1770                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1771                                 &pfk->sk, sock_net(&pfk->sk));
1772         pfk->dump.skb = out_skb;
1773
1774         return 0;
1775 }
1776
1777 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1778 {
1779         struct net *net = sock_net(&pfk->sk);
1780         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1781 }
1782
1783 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1784 {
1785         xfrm_state_walk_done(&pfk->dump.u.state);
1786 }
1787
1788 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1789 {
1790         u8 proto;
1791         struct pfkey_sock *pfk = pfkey_sk(sk);
1792
1793         if (pfk->dump.dump != NULL)
1794                 return -EBUSY;
1795
1796         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1797         if (proto == 0)
1798                 return -EINVAL;
1799
1800         pfk->dump.msg_version = hdr->sadb_msg_version;
1801         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1802         pfk->dump.dump = pfkey_dump_sa;
1803         pfk->dump.done = pfkey_dump_sa_done;
1804         xfrm_state_walk_init(&pfk->dump.u.state, proto);
1805
1806         return pfkey_do_dump(pfk);
1807 }
1808
1809 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1810 {
1811         struct pfkey_sock *pfk = pfkey_sk(sk);
1812         int satype = hdr->sadb_msg_satype;
1813         bool reset_errno = false;
1814
1815         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1816                 reset_errno = true;
1817                 if (satype != 0 && satype != 1)
1818                         return -EINVAL;
1819                 pfk->promisc = satype;
1820         }
1821         if (reset_errno && skb_cloned(skb))
1822                 skb = skb_copy(skb, GFP_KERNEL);
1823         else
1824                 skb = skb_clone(skb, GFP_KERNEL);
1825
1826         if (reset_errno && skb) {
1827                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1828                 new_hdr->sadb_msg_errno = 0;
1829         }
1830
1831         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1832         return 0;
1833 }
1834
1835 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1836 {
1837         int i;
1838         u32 reqid = *(u32*)ptr;
1839
1840         for (i=0; i<xp->xfrm_nr; i++) {
1841                 if (xp->xfrm_vec[i].reqid == reqid)
1842                         return -EEXIST;
1843         }
1844         return 0;
1845 }
1846
1847 static u32 gen_reqid(struct net *net)
1848 {
1849         struct xfrm_policy_walk walk;
1850         u32 start;
1851         int rc;
1852         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1853
1854         start = reqid;
1855         do {
1856                 ++reqid;
1857                 if (reqid == 0)
1858                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1859                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1860                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1861                 xfrm_policy_walk_done(&walk);
1862                 if (rc != -EEXIST)
1863                         return reqid;
1864         } while (reqid != start);
1865         return 0;
1866 }
1867
1868 static int
1869 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1870 {
1871         struct net *net = xp_net(xp);
1872         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1873         int mode;
1874
1875         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1876                 return -ELOOP;
1877
1878         if (rq->sadb_x_ipsecrequest_mode == 0)
1879                 return -EINVAL;
1880
1881         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1882         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1883                 return -EINVAL;
1884         t->mode = mode;
1885         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1886                 t->optional = 1;
1887         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1888                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1889                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1890                         t->reqid = 0;
1891                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1892                         return -ENOBUFS;
1893         }
1894
1895         /* addresses present only in tunnel mode */
1896         if (t->mode == XFRM_MODE_TUNNEL) {
1897                 u8 *sa = (u8 *) (rq + 1);
1898                 int family, socklen;
1899
1900                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1901                                                 &t->saddr);
1902                 if (!family)
1903                         return -EINVAL;
1904
1905                 socklen = pfkey_sockaddr_len(family);
1906                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1907                                            &t->id.daddr) != family)
1908                         return -EINVAL;
1909                 t->encap_family = family;
1910         } else
1911                 t->encap_family = xp->family;
1912
1913         /* No way to set this via kame pfkey */
1914         t->allalgs = 1;
1915         xp->xfrm_nr++;
1916         return 0;
1917 }
1918
1919 static int
1920 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1921 {
1922         int err;
1923         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1924         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1925
1926         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1927                 return -EINVAL;
1928
1929         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1930                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1931                         return err;
1932                 len -= rq->sadb_x_ipsecrequest_len;
1933                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1934         }
1935         return 0;
1936 }
1937
1938 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1939 {
1940   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1941
1942         if (xfrm_ctx) {
1943                 int len = sizeof(struct sadb_x_sec_ctx);
1944                 len += xfrm_ctx->ctx_len;
1945                 return PFKEY_ALIGN8(len);
1946         }
1947         return 0;
1948 }
1949
1950 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1951 {
1952         const struct xfrm_tmpl *t;
1953         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1954         int socklen = 0;
1955         int i;
1956
1957         for (i=0; i<xp->xfrm_nr; i++) {
1958                 t = xp->xfrm_vec + i;
1959                 socklen += pfkey_sockaddr_len(t->encap_family);
1960         }
1961
1962         return sizeof(struct sadb_msg) +
1963                 (sizeof(struct sadb_lifetime) * 3) +
1964                 (sizeof(struct sadb_address) * 2) +
1965                 (sockaddr_size * 2) +
1966                 sizeof(struct sadb_x_policy) +
1967                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1968                 (socklen * 2) +
1969                 pfkey_xfrm_policy2sec_ctx_size(xp);
1970 }
1971
1972 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1973 {
1974         struct sk_buff *skb;
1975         int size;
1976
1977         size = pfkey_xfrm_policy2msg_size(xp);
1978
1979         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1980         if (skb == NULL)
1981                 return ERR_PTR(-ENOBUFS);
1982
1983         return skb;
1984 }
1985
1986 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1987 {
1988         struct sadb_msg *hdr;
1989         struct sadb_address *addr;
1990         struct sadb_lifetime *lifetime;
1991         struct sadb_x_policy *pol;
1992         struct sadb_x_sec_ctx *sec_ctx;
1993         struct xfrm_sec_ctx *xfrm_ctx;
1994         int i;
1995         int size;
1996         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1997         int socklen = pfkey_sockaddr_len(xp->family);
1998
1999         size = pfkey_xfrm_policy2msg_size(xp);
2000
2001         /* call should fill header later */
2002         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2003         memset(hdr, 0, size);   /* XXX do we need this ? */
2004
2005         /* src address */
2006         addr = (struct sadb_address*) skb_put(skb,
2007                                               sizeof(struct sadb_address)+sockaddr_size);
2008         addr->sadb_address_len =
2009                 (sizeof(struct sadb_address)+sockaddr_size)/
2010                         sizeof(uint64_t);
2011         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2012         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2013         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2014         addr->sadb_address_reserved = 0;
2015         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2016                                  xp->selector.sport,
2017                                  (struct sockaddr *) (addr + 1),
2018                                  xp->family))
2019                 BUG();
2020
2021         /* dst address */
2022         addr = (struct sadb_address*) skb_put(skb,
2023                                               sizeof(struct sadb_address)+sockaddr_size);
2024         addr->sadb_address_len =
2025                 (sizeof(struct sadb_address)+sockaddr_size)/
2026                         sizeof(uint64_t);
2027         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2028         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2029         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2030         addr->sadb_address_reserved = 0;
2031
2032         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2033                             (struct sockaddr *) (addr + 1),
2034                             xp->family);
2035
2036         /* hard time */
2037         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2038                                                      sizeof(struct sadb_lifetime));
2039         lifetime->sadb_lifetime_len =
2040                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2041         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2042         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2043         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2044         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2045         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2046         /* soft time */
2047         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2048                                                      sizeof(struct sadb_lifetime));
2049         lifetime->sadb_lifetime_len =
2050                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2051         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2052         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2053         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2054         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2055         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2056         /* current time */
2057         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2058                                                      sizeof(struct sadb_lifetime));
2059         lifetime->sadb_lifetime_len =
2060                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2061         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2062         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2063         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2064         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2065         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2066
2067         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2068         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2069         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2070         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2071         if (xp->action == XFRM_POLICY_ALLOW) {
2072                 if (xp->xfrm_nr)
2073                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2074                 else
2075                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2076         }
2077         pol->sadb_x_policy_dir = dir+1;
2078         pol->sadb_x_policy_id = xp->index;
2079         pol->sadb_x_policy_priority = xp->priority;
2080
2081         for (i=0; i<xp->xfrm_nr; i++) {
2082                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2083                 struct sadb_x_ipsecrequest *rq;
2084                 int req_size;
2085                 int mode;
2086
2087                 req_size = sizeof(struct sadb_x_ipsecrequest);
2088                 if (t->mode == XFRM_MODE_TUNNEL) {
2089                         socklen = pfkey_sockaddr_len(t->encap_family);
2090                         req_size += socklen * 2;
2091                 } else {
2092                         size -= 2*socklen;
2093                 }
2094                 rq = (void*)skb_put(skb, req_size);
2095                 pol->sadb_x_policy_len += req_size/8;
2096                 memset(rq, 0, sizeof(*rq));
2097                 rq->sadb_x_ipsecrequest_len = req_size;
2098                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2099                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2100                         return -EINVAL;
2101                 rq->sadb_x_ipsecrequest_mode = mode;
2102                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2103                 if (t->reqid)
2104                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2105                 if (t->optional)
2106                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2107                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2108
2109                 if (t->mode == XFRM_MODE_TUNNEL) {
2110                         u8 *sa = (void *)(rq + 1);
2111                         pfkey_sockaddr_fill(&t->saddr, 0,
2112                                             (struct sockaddr *)sa,
2113                                             t->encap_family);
2114                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2115                                             (struct sockaddr *) (sa + socklen),
2116                                             t->encap_family);
2117                 }
2118         }
2119
2120         /* security context */
2121         if ((xfrm_ctx = xp->security)) {
2122                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2123
2124                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2125                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2126                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2127                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2128                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2129                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2130                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2131                        xfrm_ctx->ctx_len);
2132         }
2133
2134         hdr->sadb_msg_len = size / sizeof(uint64_t);
2135         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2136
2137         return 0;
2138 }
2139
2140 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2141 {
2142         struct sk_buff *out_skb;
2143         struct sadb_msg *out_hdr;
2144         int err;
2145
2146         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2147         if (IS_ERR(out_skb))
2148                 return PTR_ERR(out_skb);
2149
2150         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2151         if (err < 0)
2152                 return err;
2153
2154         out_hdr = (struct sadb_msg *) out_skb->data;
2155         out_hdr->sadb_msg_version = PF_KEY_V2;
2156
2157         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2158                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2159         else
2160                 out_hdr->sadb_msg_type = event2poltype(c->event);
2161         out_hdr->sadb_msg_errno = 0;
2162         out_hdr->sadb_msg_seq = c->seq;
2163         out_hdr->sadb_msg_pid = c->portid;
2164         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2165         return 0;
2166
2167 }
2168
2169 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2170 {
2171         struct net *net = sock_net(sk);
2172         int err = 0;
2173         struct sadb_lifetime *lifetime;
2174         struct sadb_address *sa;
2175         struct sadb_x_policy *pol;
2176         struct xfrm_policy *xp;
2177         struct km_event c;
2178         struct sadb_x_sec_ctx *sec_ctx;
2179
2180         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2181                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2182             !ext_hdrs[SADB_X_EXT_POLICY-1])
2183                 return -EINVAL;
2184
2185         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2186         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2187                 return -EINVAL;
2188         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2189                 return -EINVAL;
2190
2191         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2192         if (xp == NULL)
2193                 return -ENOBUFS;
2194
2195         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2196                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2197         xp->priority = pol->sadb_x_policy_priority;
2198
2199         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2200         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2201         if (!xp->family) {
2202                 err = -EINVAL;
2203                 goto out;
2204         }
2205         xp->selector.family = xp->family;
2206         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2207         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2208         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2209         if (xp->selector.sport)
2210                 xp->selector.sport_mask = htons(0xffff);
2211
2212         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2213         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2214         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2215
2216         /* Amusing, we set this twice.  KAME apps appear to set same value
2217          * in both addresses.
2218          */
2219         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2220
2221         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2222         if (xp->selector.dport)
2223                 xp->selector.dport_mask = htons(0xffff);
2224
2225         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2226         if (sec_ctx != NULL) {
2227                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2228
2229                 if (!uctx) {
2230                         err = -ENOBUFS;
2231                         goto out;
2232                 }
2233
2234                 err = security_xfrm_policy_alloc(&xp->security, uctx);
2235                 kfree(uctx);
2236
2237                 if (err)
2238                         goto out;
2239         }
2240
2241         xp->lft.soft_byte_limit = XFRM_INF;
2242         xp->lft.hard_byte_limit = XFRM_INF;
2243         xp->lft.soft_packet_limit = XFRM_INF;
2244         xp->lft.hard_packet_limit = XFRM_INF;
2245         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2246                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2247                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2248                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2249                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2250         }
2251         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2252                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2253                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2254                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2255                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2256         }
2257         xp->xfrm_nr = 0;
2258         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2259             (err = parse_ipsecrequests(xp, pol)) < 0)
2260                 goto out;
2261
2262         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2263                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2264
2265         xfrm_audit_policy_add(xp, err ? 0 : 1,
2266                               audit_get_loginuid(current),
2267                               audit_get_sessionid(current), 0);
2268
2269         if (err)
2270                 goto out;
2271
2272         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2273                 c.event = XFRM_MSG_UPDPOLICY;
2274         else
2275                 c.event = XFRM_MSG_NEWPOLICY;
2276
2277         c.seq = hdr->sadb_msg_seq;
2278         c.portid = hdr->sadb_msg_pid;
2279
2280         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2281         xfrm_pol_put(xp);
2282         return 0;
2283
2284 out:
2285         xp->walk.dead = 1;
2286         xfrm_policy_destroy(xp);
2287         return err;
2288 }
2289
2290 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2291 {
2292         struct net *net = sock_net(sk);
2293         int err;
2294         struct sadb_address *sa;
2295         struct sadb_x_policy *pol;
2296         struct xfrm_policy *xp;
2297         struct xfrm_selector sel;
2298         struct km_event c;
2299         struct sadb_x_sec_ctx *sec_ctx;
2300         struct xfrm_sec_ctx *pol_ctx = NULL;
2301
2302         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2303                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2304             !ext_hdrs[SADB_X_EXT_POLICY-1])
2305                 return -EINVAL;
2306
2307         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2308         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2309                 return -EINVAL;
2310
2311         memset(&sel, 0, sizeof(sel));
2312
2313         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2314         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2315         sel.prefixlen_s = sa->sadb_address_prefixlen;
2316         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2317         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2318         if (sel.sport)
2319                 sel.sport_mask = htons(0xffff);
2320
2321         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2322         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2323         sel.prefixlen_d = sa->sadb_address_prefixlen;
2324         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2325         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2326         if (sel.dport)
2327                 sel.dport_mask = htons(0xffff);
2328
2329         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2330         if (sec_ctx != NULL) {
2331                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2332
2333                 if (!uctx)
2334                         return -ENOMEM;
2335
2336                 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2337                 kfree(uctx);
2338                 if (err)
2339                         return err;
2340         }
2341
2342         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2343                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2344                                    1, &err);
2345         security_xfrm_policy_free(pol_ctx);
2346         if (xp == NULL)
2347                 return -ENOENT;
2348
2349         xfrm_audit_policy_delete(xp, err ? 0 : 1,
2350                                  audit_get_loginuid(current),
2351                                  audit_get_sessionid(current), 0);
2352
2353         if (err)
2354                 goto out;
2355
2356         c.seq = hdr->sadb_msg_seq;
2357         c.portid = hdr->sadb_msg_pid;
2358         c.data.byid = 0;
2359         c.event = XFRM_MSG_DELPOLICY;
2360         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2361
2362 out:
2363         xfrm_pol_put(xp);
2364         return err;
2365 }
2366
2367 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2368 {
2369         int err;
2370         struct sk_buff *out_skb;
2371         struct sadb_msg *out_hdr;
2372         err = 0;
2373
2374         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2375         if (IS_ERR(out_skb)) {
2376                 err =  PTR_ERR(out_skb);
2377                 goto out;
2378         }
2379         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2380         if (err < 0)
2381                 goto out;
2382
2383         out_hdr = (struct sadb_msg *) out_skb->data;
2384         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2385         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2386         out_hdr->sadb_msg_satype = 0;
2387         out_hdr->sadb_msg_errno = 0;
2388         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2389         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2390         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2391         err = 0;
2392
2393 out:
2394         return err;
2395 }
2396
2397 #ifdef CONFIG_NET_KEY_MIGRATE
2398 static int pfkey_sockaddr_pair_size(sa_family_t family)
2399 {
2400         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2401 }
2402
2403 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2404                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2405                                u16 *family)
2406 {
2407         int af, socklen;
2408
2409         if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2410                 return -EINVAL;
2411
2412         af = pfkey_sockaddr_extract(sa, saddr);
2413         if (!af)
2414                 return -EINVAL;
2415
2416         socklen = pfkey_sockaddr_len(af);
2417         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2418                                    daddr) != af)
2419                 return -EINVAL;
2420
2421         *family = af;
2422         return 0;
2423 }
2424
2425 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2426                                     struct xfrm_migrate *m)
2427 {
2428         int err;
2429         struct sadb_x_ipsecrequest *rq2;
2430         int mode;
2431
2432         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2433             len < rq1->sadb_x_ipsecrequest_len)
2434                 return -EINVAL;
2435
2436         /* old endoints */
2437         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2438                                   rq1->sadb_x_ipsecrequest_len,
2439                                   &m->old_saddr, &m->old_daddr,
2440                                   &m->old_family);
2441         if (err)
2442                 return err;
2443
2444         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2445         len -= rq1->sadb_x_ipsecrequest_len;
2446
2447         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2448             len < rq2->sadb_x_ipsecrequest_len)
2449                 return -EINVAL;
2450
2451         /* new endpoints */
2452         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2453                                   rq2->sadb_x_ipsecrequest_len,
2454                                   &m->new_saddr, &m->new_daddr,
2455                                   &m->new_family);
2456         if (err)
2457                 return err;
2458
2459         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2460             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2461             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2462                 return -EINVAL;
2463
2464         m->proto = rq1->sadb_x_ipsecrequest_proto;
2465         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2466                 return -EINVAL;
2467         m->mode = mode;
2468         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2469
2470         return ((int)(rq1->sadb_x_ipsecrequest_len +
2471                       rq2->sadb_x_ipsecrequest_len));
2472 }
2473
2474 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2475                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2476 {
2477         int i, len, ret, err = -EINVAL;
2478         u8 dir;
2479         struct sadb_address *sa;
2480         struct sadb_x_kmaddress *kma;
2481         struct sadb_x_policy *pol;
2482         struct sadb_x_ipsecrequest *rq;
2483         struct xfrm_selector sel;
2484         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2485         struct xfrm_kmaddress k;
2486
2487         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2488                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2489             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2490                 err = -EINVAL;
2491                 goto out;
2492         }
2493
2494         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2495         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2496
2497         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2498                 err = -EINVAL;
2499                 goto out;
2500         }
2501
2502         if (kma) {
2503                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2504                 k.reserved = kma->sadb_x_kmaddress_reserved;
2505                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2506                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2507                                           &k.local, &k.remote, &k.family);
2508                 if (ret < 0) {
2509                         err = ret;
2510                         goto out;
2511                 }
2512         }
2513
2514         dir = pol->sadb_x_policy_dir - 1;
2515         memset(&sel, 0, sizeof(sel));
2516
2517         /* set source address info of selector */
2518         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2519         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2520         sel.prefixlen_s = sa->sadb_address_prefixlen;
2521         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2522         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2523         if (sel.sport)
2524                 sel.sport_mask = htons(0xffff);
2525
2526         /* set destination address info of selector */
2527         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2528         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2529         sel.prefixlen_d = sa->sadb_address_prefixlen;
2530         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2531         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2532         if (sel.dport)
2533                 sel.dport_mask = htons(0xffff);
2534
2535         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2536
2537         /* extract ipsecrequests */
2538         i = 0;
2539         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2540
2541         while (len > 0 && i < XFRM_MAX_DEPTH) {
2542                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2543                 if (ret < 0) {
2544                         err = ret;
2545                         goto out;
2546                 } else {
2547                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2548                         len -= ret;
2549                         i++;
2550                 }
2551         }
2552
2553         if (!i || len > 0) {
2554                 err = -EINVAL;
2555                 goto out;
2556         }
2557
2558         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2559                             kma ? &k : NULL);
2560
2561  out:
2562         return err;
2563 }
2564 #else
2565 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2566                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2567 {
2568         return -ENOPROTOOPT;
2569 }
2570 #endif
2571
2572
2573 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2574 {
2575         struct net *net = sock_net(sk);
2576         unsigned int dir;
2577         int err = 0, delete;
2578         struct sadb_x_policy *pol;
2579         struct xfrm_policy *xp;
2580         struct km_event c;
2581
2582         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2583                 return -EINVAL;
2584
2585         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2586         if (dir >= XFRM_POLICY_MAX)
2587                 return -EINVAL;
2588
2589         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2590         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2591                               dir, pol->sadb_x_policy_id, delete, &err);
2592         if (xp == NULL)
2593                 return -ENOENT;
2594
2595         if (delete) {
2596                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2597                                 audit_get_loginuid(current),
2598                                 audit_get_sessionid(current), 0);
2599
2600                 if (err)
2601                         goto out;
2602                 c.seq = hdr->sadb_msg_seq;
2603                 c.portid = hdr->sadb_msg_pid;
2604                 c.data.byid = 1;
2605                 c.event = XFRM_MSG_DELPOLICY;
2606                 km_policy_notify(xp, dir, &c);
2607         } else {
2608                 err = key_pol_get_resp(sk, xp, hdr, dir);
2609         }
2610
2611 out:
2612         xfrm_pol_put(xp);
2613         return err;
2614 }
2615
2616 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2617 {
2618         struct pfkey_sock *pfk = ptr;
2619         struct sk_buff *out_skb;
2620         struct sadb_msg *out_hdr;
2621         int err;
2622
2623         if (!pfkey_can_dump(&pfk->sk))
2624                 return -ENOBUFS;
2625
2626         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2627         if (IS_ERR(out_skb))
2628                 return PTR_ERR(out_skb);
2629
2630         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2631         if (err < 0)
2632                 return err;
2633
2634         out_hdr = (struct sadb_msg *) out_skb->data;
2635         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2636         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2637         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2638         out_hdr->sadb_msg_errno = 0;
2639         out_hdr->sadb_msg_seq = count + 1;
2640         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2641
2642         if (pfk->dump.skb)
2643                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2644                                 &pfk->sk, sock_net(&pfk->sk));
2645         pfk->dump.skb = out_skb;
2646
2647         return 0;
2648 }
2649
2650 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2651 {
2652         struct net *net = sock_net(&pfk->sk);
2653         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2654 }
2655
2656 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2657 {
2658         xfrm_policy_walk_done(&pfk->dump.u.policy);
2659 }
2660
2661 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2662 {
2663         struct pfkey_sock *pfk = pfkey_sk(sk);
2664
2665         if (pfk->dump.dump != NULL)
2666                 return -EBUSY;
2667
2668         pfk->dump.msg_version = hdr->sadb_msg_version;
2669         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2670         pfk->dump.dump = pfkey_dump_sp;
2671         pfk->dump.done = pfkey_dump_sp_done;
2672         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2673
2674         return pfkey_do_dump(pfk);
2675 }
2676
2677 static int key_notify_policy_flush(const struct km_event *c)
2678 {
2679         struct sk_buff *skb_out;
2680         struct sadb_msg *hdr;
2681
2682         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2683         if (!skb_out)
2684                 return -ENOBUFS;
2685         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2686         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2687         hdr->sadb_msg_seq = c->seq;
2688         hdr->sadb_msg_pid = c->portid;
2689         hdr->sadb_msg_version = PF_KEY_V2;
2690         hdr->sadb_msg_errno = (uint8_t) 0;
2691         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2692         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2693         return 0;
2694
2695 }
2696
2697 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2698 {
2699         struct net *net = sock_net(sk);
2700         struct km_event c;
2701         struct xfrm_audit audit_info;
2702         int err, err2;
2703
2704         audit_info.loginuid = audit_get_loginuid(current);
2705         audit_info.sessionid = audit_get_sessionid(current);
2706         audit_info.secid = 0;
2707         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2708         err2 = unicast_flush_resp(sk, hdr);
2709         if (err || err2) {
2710                 if (err == -ESRCH) /* empty table - old silent behavior */
2711                         return 0;
2712                 return err;
2713         }
2714
2715         c.data.type = XFRM_POLICY_TYPE_MAIN;
2716         c.event = XFRM_MSG_FLUSHPOLICY;
2717         c.portid = hdr->sadb_msg_pid;
2718         c.seq = hdr->sadb_msg_seq;
2719         c.net = net;
2720         km_policy_notify(NULL, 0, &c);
2721
2722         return 0;
2723 }
2724
2725 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2726                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2727 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2728         [SADB_RESERVED]         = pfkey_reserved,
2729         [SADB_GETSPI]           = pfkey_getspi,
2730         [SADB_UPDATE]           = pfkey_add,
2731         [SADB_ADD]              = pfkey_add,
2732         [SADB_DELETE]           = pfkey_delete,
2733         [SADB_GET]              = pfkey_get,
2734         [SADB_ACQUIRE]          = pfkey_acquire,
2735         [SADB_REGISTER]         = pfkey_register,
2736         [SADB_EXPIRE]           = NULL,
2737         [SADB_FLUSH]            = pfkey_flush,
2738         [SADB_DUMP]             = pfkey_dump,
2739         [SADB_X_PROMISC]        = pfkey_promisc,
2740         [SADB_X_PCHANGE]        = NULL,
2741         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2742         [SADB_X_SPDADD]         = pfkey_spdadd,
2743         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2744         [SADB_X_SPDGET]         = pfkey_spdget,
2745         [SADB_X_SPDACQUIRE]     = NULL,
2746         [SADB_X_SPDDUMP]        = pfkey_spddump,
2747         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2748         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2749         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2750         [SADB_X_MIGRATE]        = pfkey_migrate,
2751 };
2752
2753 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2754 {
2755         void *ext_hdrs[SADB_EXT_MAX];
2756         int err;
2757
2758         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2759                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2760
2761         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2762         err = parse_exthdrs(skb, hdr, ext_hdrs);
2763         if (!err) {
2764                 err = -EOPNOTSUPP;
2765                 if (pfkey_funcs[hdr->sadb_msg_type])
2766                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2767         }
2768         return err;
2769 }
2770
2771 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2772 {
2773         struct sadb_msg *hdr = NULL;
2774
2775         if (skb->len < sizeof(*hdr)) {
2776                 *errp = -EMSGSIZE;
2777         } else {
2778                 hdr = (struct sadb_msg *) skb->data;
2779                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2780                     hdr->sadb_msg_reserved != 0 ||
2781                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2782                      hdr->sadb_msg_type > SADB_MAX)) {
2783                         hdr = NULL;
2784                         *errp = -EINVAL;
2785                 } else if (hdr->sadb_msg_len != (skb->len /
2786                                                  sizeof(uint64_t)) ||
2787                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2788                                                 sizeof(uint64_t))) {
2789                         hdr = NULL;
2790                         *errp = -EMSGSIZE;
2791                 } else {
2792                         *errp = 0;
2793                 }
2794         }
2795         return hdr;
2796 }
2797
2798 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2799                                 const struct xfrm_algo_desc *d)
2800 {
2801         unsigned int id = d->desc.sadb_alg_id;
2802
2803         if (id >= sizeof(t->aalgos) * 8)
2804                 return 0;
2805
2806         return (t->aalgos >> id) & 1;
2807 }
2808
2809 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2810                                 const struct xfrm_algo_desc *d)
2811 {
2812         unsigned int id = d->desc.sadb_alg_id;
2813
2814         if (id >= sizeof(t->ealgos) * 8)
2815                 return 0;
2816
2817         return (t->ealgos >> id) & 1;
2818 }
2819
2820 static int count_ah_combs(const struct xfrm_tmpl *t)
2821 {
2822         int i, sz = 0;
2823
2824         for (i = 0; ; i++) {
2825                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2826                 if (!aalg)
2827                         break;
2828                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2829                         sz += sizeof(struct sadb_comb);
2830         }
2831         return sz + sizeof(struct sadb_prop);
2832 }
2833
2834 static int count_esp_combs(const struct xfrm_tmpl *t)
2835 {
2836         int i, k, sz = 0;
2837
2838         for (i = 0; ; i++) {
2839                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2840                 if (!ealg)
2841                         break;
2842
2843                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2844                         continue;
2845
2846                 for (k = 1; ; k++) {
2847                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2848                         if (!aalg)
2849                                 break;
2850
2851                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2852                                 sz += sizeof(struct sadb_comb);
2853                 }
2854         }
2855         return sz + sizeof(struct sadb_prop);
2856 }
2857
2858 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2859 {
2860         struct sadb_prop *p;
2861         int i;
2862
2863         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2864         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2865         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2866         p->sadb_prop_replay = 32;
2867         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2868
2869         for (i = 0; ; i++) {
2870                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2871                 if (!aalg)
2872                         break;
2873
2874                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2875                         struct sadb_comb *c;
2876                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2877                         memset(c, 0, sizeof(*c));
2878                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2879                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2880                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2881                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2882                         c->sadb_comb_hard_addtime = 24*60*60;
2883                         c->sadb_comb_soft_addtime = 20*60*60;
2884                         c->sadb_comb_hard_usetime = 8*60*60;
2885                         c->sadb_comb_soft_usetime = 7*60*60;
2886                 }
2887         }
2888 }
2889
2890 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2891 {
2892         struct sadb_prop *p;
2893         int i, k;
2894
2895         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2896         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2897         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2898         p->sadb_prop_replay = 32;
2899         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2900
2901         for (i=0; ; i++) {
2902                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2903                 if (!ealg)
2904                         break;
2905
2906                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2907                         continue;
2908
2909                 for (k = 1; ; k++) {
2910                         struct sadb_comb *c;
2911                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2912                         if (!aalg)
2913                                 break;
2914                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2915                                 continue;
2916                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2917                         memset(c, 0, sizeof(*c));
2918                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2919                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2920                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2921                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2922                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2923                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2924                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2925                         c->sadb_comb_hard_addtime = 24*60*60;
2926                         c->sadb_comb_soft_addtime = 20*60*60;
2927                         c->sadb_comb_hard_usetime = 8*60*60;
2928                         c->sadb_comb_soft_usetime = 7*60*60;
2929                 }
2930         }
2931 }
2932
2933 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2934 {
2935         return 0;
2936 }
2937
2938 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2939 {
2940         struct sk_buff *out_skb;
2941         struct sadb_msg *out_hdr;
2942         int hard;
2943         int hsc;
2944
2945         hard = c->data.hard;
2946         if (hard)
2947                 hsc = 2;
2948         else
2949                 hsc = 1;
2950
2951         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2952         if (IS_ERR(out_skb))
2953                 return PTR_ERR(out_skb);
2954
2955         out_hdr = (struct sadb_msg *) out_skb->data;
2956         out_hdr->sadb_msg_version = PF_KEY_V2;
2957         out_hdr->sadb_msg_type = SADB_EXPIRE;
2958         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2959         out_hdr->sadb_msg_errno = 0;
2960         out_hdr->sadb_msg_reserved = 0;
2961         out_hdr->sadb_msg_seq = 0;
2962         out_hdr->sadb_msg_pid = 0;
2963
2964         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2965         return 0;
2966 }
2967
2968 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2969 {
2970         struct net *net = x ? xs_net(x) : c->net;
2971         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
2972
2973         if (atomic_read(&net_pfkey->socks_nr) == 0)
2974                 return 0;
2975
2976         switch (c->event) {
2977         case XFRM_MSG_EXPIRE:
2978                 return key_notify_sa_expire(x, c);
2979         case XFRM_MSG_DELSA:
2980         case XFRM_MSG_NEWSA:
2981         case XFRM_MSG_UPDSA:
2982                 return key_notify_sa(x, c);
2983         case XFRM_MSG_FLUSHSA:
2984                 return key_notify_sa_flush(c);
2985         case XFRM_MSG_NEWAE: /* not yet supported */
2986                 break;
2987         default:
2988                 pr_err("pfkey: Unknown SA event %d\n", c->event);
2989                 break;
2990         }
2991
2992         return 0;
2993 }
2994
2995 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2996 {
2997         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
2998                 return 0;
2999
3000         switch (c->event) {
3001         case XFRM_MSG_POLEXPIRE:
3002                 return key_notify_policy_expire(xp, c);
3003         case XFRM_MSG_DELPOLICY:
3004         case XFRM_MSG_NEWPOLICY:
3005         case XFRM_MSG_UPDPOLICY:
3006                 return key_notify_policy(xp, dir, c);
3007         case XFRM_MSG_FLUSHPOLICY:
3008                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3009                         break;
3010                 return key_notify_policy_flush(c);
3011         default:
3012                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3013                 break;
3014         }
3015
3016         return 0;
3017 }
3018
3019 static u32 get_acqseq(void)
3020 {
3021         u32 res;
3022         static atomic_t acqseq;
3023
3024         do {
3025                 res = atomic_inc_return(&acqseq);
3026         } while (!res);
3027         return res;
3028 }
3029
3030 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3031 {
3032         struct sk_buff *skb;
3033         struct sadb_msg *hdr;
3034         struct sadb_address *addr;
3035         struct sadb_x_policy *pol;
3036         int sockaddr_size;
3037         int size;
3038         struct sadb_x_sec_ctx *sec_ctx;
3039         struct xfrm_sec_ctx *xfrm_ctx;
3040         int ctx_size = 0;
3041
3042         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3043         if (!sockaddr_size)
3044                 return -EINVAL;
3045
3046         size = sizeof(struct sadb_msg) +
3047                 (sizeof(struct sadb_address) * 2) +
3048                 (sockaddr_size * 2) +
3049                 sizeof(struct sadb_x_policy);
3050
3051         if (x->id.proto == IPPROTO_AH)
3052                 size += count_ah_combs(t);
3053         else if (x->id.proto == IPPROTO_ESP)
3054                 size += count_esp_combs(t);
3055
3056         if ((xfrm_ctx = x->security)) {
3057                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3058                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3059         }
3060
3061         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3062         if (skb == NULL)
3063                 return -ENOMEM;
3064
3065         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3066         hdr->sadb_msg_version = PF_KEY_V2;
3067         hdr->sadb_msg_type = SADB_ACQUIRE;
3068         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3069         hdr->sadb_msg_len = size / sizeof(uint64_t);
3070         hdr->sadb_msg_errno = 0;
3071         hdr->sadb_msg_reserved = 0;
3072         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3073         hdr->sadb_msg_pid = 0;
3074
3075         /* src address */
3076         addr = (struct sadb_address*) skb_put(skb,
3077                                               sizeof(struct sadb_address)+sockaddr_size);
3078         addr->sadb_address_len =
3079                 (sizeof(struct sadb_address)+sockaddr_size)/
3080                         sizeof(uint64_t);
3081         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3082         addr->sadb_address_proto = 0;
3083         addr->sadb_address_reserved = 0;
3084         addr->sadb_address_prefixlen =
3085                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3086                                     (struct sockaddr *) (addr + 1),
3087                                     x->props.family);
3088         if (!addr->sadb_address_prefixlen)
3089                 BUG();
3090
3091         /* dst address */
3092         addr = (struct sadb_address*) skb_put(skb,
3093                                               sizeof(struct sadb_address)+sockaddr_size);
3094         addr->sadb_address_len =
3095                 (sizeof(struct sadb_address)+sockaddr_size)/
3096                         sizeof(uint64_t);
3097         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3098         addr->sadb_address_proto = 0;
3099         addr->sadb_address_reserved = 0;
3100         addr->sadb_address_prefixlen =
3101                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3102                                     (struct sockaddr *) (addr + 1),
3103                                     x->props.family);
3104         if (!addr->sadb_address_prefixlen)
3105                 BUG();
3106
3107         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3108         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3109         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3110         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3111         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3112         pol->sadb_x_policy_id = xp->index;
3113
3114         /* Set sadb_comb's. */
3115         if (x->id.proto == IPPROTO_AH)
3116                 dump_ah_combs(skb, t);
3117         else if (x->id.proto == IPPROTO_ESP)
3118                 dump_esp_combs(skb, t);
3119
3120         /* security context */
3121         if (xfrm_ctx) {
3122                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3123                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3124                 sec_ctx->sadb_x_sec_len =
3125                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3126                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3127                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3128                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3129                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3130                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3131                        xfrm_ctx->ctx_len);
3132         }
3133
3134         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3135 }
3136
3137 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3138                                                 u8 *data, int len, int *dir)
3139 {
3140         struct net *net = sock_net(sk);
3141         struct xfrm_policy *xp;
3142         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3143         struct sadb_x_sec_ctx *sec_ctx;
3144
3145         switch (sk->sk_family) {
3146         case AF_INET:
3147                 if (opt != IP_IPSEC_POLICY) {
3148                         *dir = -EOPNOTSUPP;
3149                         return NULL;
3150                 }
3151                 break;
3152 #if IS_ENABLED(CONFIG_IPV6)
3153         case AF_INET6:
3154                 if (opt != IPV6_IPSEC_POLICY) {
3155                         *dir = -EOPNOTSUPP;
3156                         return NULL;
3157                 }
3158                 break;
3159 #endif
3160         default:
3161                 *dir = -EINVAL;
3162                 return NULL;
3163         }
3164
3165         *dir = -EINVAL;
3166
3167         if (len < sizeof(struct sadb_x_policy) ||
3168             pol->sadb_x_policy_len*8 > len ||
3169             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3170             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3171                 return NULL;
3172
3173         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3174         if (xp == NULL) {
3175                 *dir = -ENOBUFS;
3176                 return NULL;
3177         }
3178
3179         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3180                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3181
3182         xp->lft.soft_byte_limit = XFRM_INF;
3183         xp->lft.hard_byte_limit = XFRM_INF;
3184         xp->lft.soft_packet_limit = XFRM_INF;
3185         xp->lft.hard_packet_limit = XFRM_INF;
3186         xp->family = sk->sk_family;
3187
3188         xp->xfrm_nr = 0;
3189         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3190             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3191                 goto out;
3192
3193         /* security context too */
3194         if (len >= (pol->sadb_x_policy_len*8 +
3195             sizeof(struct sadb_x_sec_ctx))) {
3196                 char *p = (char *)pol;
3197                 struct xfrm_user_sec_ctx *uctx;
3198
3199                 p += pol->sadb_x_policy_len*8;
3200                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3201                 if (len < pol->sadb_x_policy_len*8 +
3202                     sec_ctx->sadb_x_sec_len) {
3203                         *dir = -EINVAL;
3204                         goto out;
3205                 }
3206                 if ((*dir = verify_sec_ctx_len(p)))
3207                         goto out;
3208                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3209                 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3210                 kfree(uctx);
3211
3212                 if (*dir)
3213                         goto out;
3214         }
3215
3216         *dir = pol->sadb_x_policy_dir-1;
3217         return xp;
3218
3219 out:
3220         xp->walk.dead = 1;
3221         xfrm_policy_destroy(xp);
3222         return NULL;
3223 }
3224
3225 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3226 {
3227         struct sk_buff *skb;
3228         struct sadb_msg *hdr;
3229         struct sadb_sa *sa;
3230         struct sadb_address *addr;
3231         struct sadb_x_nat_t_port *n_port;
3232         int sockaddr_size;
3233         int size;
3234         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3235         struct xfrm_encap_tmpl *natt = NULL;
3236
3237         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3238         if (!sockaddr_size)
3239                 return -EINVAL;
3240
3241         if (!satype)
3242                 return -EINVAL;
3243
3244         if (!x->encap)
3245                 return -EINVAL;
3246
3247         natt = x->encap;
3248
3249         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3250          *
3251          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3252          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3253          */
3254
3255         size = sizeof(struct sadb_msg) +
3256                 sizeof(struct sadb_sa) +
3257                 (sizeof(struct sadb_address) * 2) +
3258                 (sockaddr_size * 2) +
3259                 (sizeof(struct sadb_x_nat_t_port) * 2);
3260
3261         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3262         if (skb == NULL)
3263                 return -ENOMEM;
3264
3265         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3266         hdr->sadb_msg_version = PF_KEY_V2;
3267         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3268         hdr->sadb_msg_satype = satype;
3269         hdr->sadb_msg_len = size / sizeof(uint64_t);
3270         hdr->sadb_msg_errno = 0;
3271         hdr->sadb_msg_reserved = 0;
3272         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3273         hdr->sadb_msg_pid = 0;
3274
3275         /* SA */
3276         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3277         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3278         sa->sadb_sa_exttype = SADB_EXT_SA;
3279         sa->sadb_sa_spi = x->id.spi;
3280         sa->sadb_sa_replay = 0;
3281         sa->sadb_sa_state = 0;
3282         sa->sadb_sa_auth = 0;
3283         sa->sadb_sa_encrypt = 0;
3284         sa->sadb_sa_flags = 0;
3285
3286         /* ADDRESS_SRC (old addr) */
3287         addr = (struct sadb_address*)
3288                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3289         addr->sadb_address_len =
3290                 (sizeof(struct sadb_address)+sockaddr_size)/
3291                         sizeof(uint64_t);
3292         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3293         addr->sadb_address_proto = 0;
3294         addr->sadb_address_reserved = 0;
3295         addr->sadb_address_prefixlen =
3296                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3297                                     (struct sockaddr *) (addr + 1),
3298                                     x->props.family);
3299         if (!addr->sadb_address_prefixlen)
3300                 BUG();
3301
3302         /* NAT_T_SPORT (old port) */
3303         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3304         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3305         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3306         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3307         n_port->sadb_x_nat_t_port_reserved = 0;
3308
3309         /* ADDRESS_DST (new addr) */
3310         addr = (struct sadb_address*)
3311                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3312         addr->sadb_address_len =
3313                 (sizeof(struct sadb_address)+sockaddr_size)/
3314                         sizeof(uint64_t);
3315         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3316         addr->sadb_address_proto = 0;
3317         addr->sadb_address_reserved = 0;
3318         addr->sadb_address_prefixlen =
3319                 pfkey_sockaddr_fill(ipaddr, 0,
3320                                     (struct sockaddr *) (addr + 1),
3321                                     x->props.family);
3322         if (!addr->sadb_address_prefixlen)
3323                 BUG();
3324
3325         /* NAT_T_DPORT (new port) */
3326         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3327         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3328         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3329         n_port->sadb_x_nat_t_port_port = sport;
3330         n_port->sadb_x_nat_t_port_reserved = 0;
3331
3332         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3333 }
3334
3335 #ifdef CONFIG_NET_KEY_MIGRATE
3336 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3337                             const struct xfrm_selector *sel)
3338 {
3339         struct sadb_address *addr;
3340         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3341         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3342         addr->sadb_address_exttype = type;
3343         addr->sadb_address_proto = sel->proto;
3344         addr->sadb_address_reserved = 0;
3345
3346         switch (type) {
3347         case SADB_EXT_ADDRESS_SRC:
3348                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3349                 pfkey_sockaddr_fill(&sel->saddr, 0,
3350                                     (struct sockaddr *)(addr + 1),
3351                                     sel->family);
3352                 break;
3353         case SADB_EXT_ADDRESS_DST:
3354                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3355                 pfkey_sockaddr_fill(&sel->daddr, 0,
3356                                     (struct sockaddr *)(addr + 1),
3357                                     sel->family);
3358                 break;
3359         default:
3360                 return -EINVAL;
3361         }
3362
3363         return 0;
3364 }
3365
3366
3367 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3368 {
3369         struct sadb_x_kmaddress *kma;
3370         u8 *sa;
3371         int family = k->family;
3372         int socklen = pfkey_sockaddr_len(family);
3373         int size_req;
3374
3375         size_req = (sizeof(struct sadb_x_kmaddress) +
3376                     pfkey_sockaddr_pair_size(family));
3377
3378         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3379         memset(kma, 0, size_req);
3380         kma->sadb_x_kmaddress_len = size_req / 8;
3381         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3382         kma->sadb_x_kmaddress_reserved = k->reserved;
3383
3384         sa = (u8 *)(kma + 1);
3385         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3386             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3387                 return -EINVAL;
3388
3389         return 0;
3390 }
3391
3392 static int set_ipsecrequest(struct sk_buff *skb,
3393                             uint8_t proto, uint8_t mode, int level,
3394                             uint32_t reqid, uint8_t family,
3395                             const xfrm_address_t *src, const xfrm_address_t *dst)
3396 {
3397         struct sadb_x_ipsecrequest *rq;
3398         u8 *sa;
3399         int socklen = pfkey_sockaddr_len(family);
3400         int size_req;
3401
3402         size_req = sizeof(struct sadb_x_ipsecrequest) +
3403                    pfkey_sockaddr_pair_size(family);
3404
3405         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3406         memset(rq, 0, size_req);
3407         rq->sadb_x_ipsecrequest_len = size_req;
3408         rq->sadb_x_ipsecrequest_proto = proto;
3409         rq->sadb_x_ipsecrequest_mode = mode;
3410         rq->sadb_x_ipsecrequest_level = level;
3411         rq->sadb_x_ipsecrequest_reqid = reqid;
3412
3413         sa = (u8 *) (rq + 1);
3414         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3415             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3416                 return -EINVAL;
3417
3418         return 0;
3419 }
3420 #endif
3421
3422 #ifdef CONFIG_NET_KEY_MIGRATE
3423 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3424                               const struct xfrm_migrate *m, int num_bundles,
3425                               const struct xfrm_kmaddress *k)
3426 {
3427         int i;
3428         int sasize_sel;
3429         int size = 0;
3430         int size_pol = 0;
3431         struct sk_buff *skb;
3432         struct sadb_msg *hdr;
3433         struct sadb_x_policy *pol;
3434         const struct xfrm_migrate *mp;
3435
3436         if (type != XFRM_POLICY_TYPE_MAIN)
3437                 return 0;
3438
3439         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3440                 return -EINVAL;
3441
3442         if (k != NULL) {
3443                 /* addresses for KM */
3444                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3445                                      pfkey_sockaddr_pair_size(k->family));
3446         }
3447
3448         /* selector */
3449         sasize_sel = pfkey_sockaddr_size(sel->family);
3450         if (!sasize_sel)
3451                 return -EINVAL;
3452         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3453
3454         /* policy info */
3455         size_pol += sizeof(struct sadb_x_policy);
3456
3457         /* ipsecrequests */
3458         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3459                 /* old locator pair */
3460                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3461                             pfkey_sockaddr_pair_size(mp->old_family);
3462                 /* new locator pair */
3463                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3464                             pfkey_sockaddr_pair_size(mp->new_family);
3465         }
3466
3467         size += sizeof(struct sadb_msg) + size_pol;
3468
3469         /* alloc buffer */
3470         skb = alloc_skb(size, GFP_ATOMIC);
3471         if (skb == NULL)
3472                 return -ENOMEM;
3473
3474         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3475         hdr->sadb_msg_version = PF_KEY_V2;
3476         hdr->sadb_msg_type = SADB_X_MIGRATE;
3477         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3478         hdr->sadb_msg_len = size / 8;
3479         hdr->sadb_msg_errno = 0;
3480         hdr->sadb_msg_reserved = 0;
3481         hdr->sadb_msg_seq = 0;
3482         hdr->sadb_msg_pid = 0;
3483
3484         /* Addresses to be used by KM for negotiation, if ext is available */
3485         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3486                 goto err;
3487
3488         /* selector src */
3489         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3490
3491         /* selector dst */
3492         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3493
3494         /* policy information */
3495         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3496         pol->sadb_x_policy_len = size_pol / 8;
3497         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3498         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3499         pol->sadb_x_policy_dir = dir + 1;
3500         pol->sadb_x_policy_id = 0;
3501         pol->sadb_x_policy_priority = 0;
3502
3503         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3504                 /* old ipsecrequest */
3505                 int mode = pfkey_mode_from_xfrm(mp->mode);
3506                 if (mode < 0)
3507                         goto err;
3508                 if (set_ipsecrequest(skb, mp->proto, mode,
3509                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3510                                      mp->reqid, mp->old_family,
3511                                      &mp->old_saddr, &mp->old_daddr) < 0)
3512                         goto err;
3513
3514                 /* new ipsecrequest */
3515                 if (set_ipsecrequest(skb, mp->proto, mode,
3516                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3517                                      mp->reqid, mp->new_family,
3518                                      &mp->new_saddr, &mp->new_daddr) < 0)
3519                         goto err;
3520         }
3521
3522         /* broadcast migrate message to sockets */
3523         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3524
3525         return 0;
3526
3527 err:
3528         kfree_skb(skb);
3529         return -EINVAL;
3530 }
3531 #else
3532 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3533                               const struct xfrm_migrate *m, int num_bundles,
3534                               const struct xfrm_kmaddress *k)
3535 {
3536         return -ENOPROTOOPT;
3537 }
3538 #endif
3539
3540 static int pfkey_sendmsg(struct kiocb *kiocb,
3541                          struct socket *sock, struct msghdr *msg, size_t len)
3542 {
3543         struct sock *sk = sock->sk;
3544         struct sk_buff *skb = NULL;
3545         struct sadb_msg *hdr = NULL;
3546         int err;
3547
3548         err = -EOPNOTSUPP;
3549         if (msg->msg_flags & MSG_OOB)
3550                 goto out;
3551
3552         err = -EMSGSIZE;
3553         if ((unsigned int)len > sk->sk_sndbuf - 32)
3554                 goto out;
3555
3556         err = -ENOBUFS;
3557         skb = alloc_skb(len, GFP_KERNEL);
3558         if (skb == NULL)
3559                 goto out;
3560
3561         err = -EFAULT;
3562         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3563                 goto out;
3564
3565         hdr = pfkey_get_base_msg(skb, &err);
3566         if (!hdr)
3567                 goto out;
3568
3569         mutex_lock(&xfrm_cfg_mutex);
3570         err = pfkey_process(sk, skb, hdr);
3571         mutex_unlock(&xfrm_cfg_mutex);
3572
3573 out:
3574         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3575                 err = 0;
3576         kfree_skb(skb);
3577
3578         return err ? : len;
3579 }
3580
3581 static int pfkey_recvmsg(struct kiocb *kiocb,
3582                          struct socket *sock, struct msghdr *msg, size_t len,
3583                          int flags)
3584 {
3585         struct sock *sk = sock->sk;
3586         struct pfkey_sock *pfk = pfkey_sk(sk);
3587         struct sk_buff *skb;
3588         int copied, err;
3589
3590         err = -EINVAL;
3591         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3592                 goto out;
3593
3594         msg->msg_namelen = 0;
3595         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3596         if (skb == NULL)
3597                 goto out;
3598
3599         copied = skb->len;
3600         if (copied > len) {
3601                 msg->msg_flags |= MSG_TRUNC;
3602                 copied = len;
3603         }
3604
3605         skb_reset_transport_header(skb);
3606         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3607         if (err)
3608                 goto out_free;
3609
3610         sock_recv_ts_and_drops(msg, sk, skb);
3611
3612         err = (flags & MSG_TRUNC) ? skb->len : copied;
3613
3614         if (pfk->dump.dump != NULL &&
3615             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3616                 pfkey_do_dump(pfk);
3617
3618 out_free:
3619         skb_free_datagram(sk, skb);
3620 out:
3621         return err;
3622 }
3623
3624 static const struct proto_ops pfkey_ops = {
3625         .family         =       PF_KEY,
3626         .owner          =       THIS_MODULE,
3627         /* Operations that make no sense on pfkey sockets. */
3628         .bind           =       sock_no_bind,
3629         .connect        =       sock_no_connect,
3630         .socketpair     =       sock_no_socketpair,
3631         .accept         =       sock_no_accept,
3632         .getname        =       sock_no_getname,
3633         .ioctl          =       sock_no_ioctl,
3634         .listen         =       sock_no_listen,
3635         .shutdown       =       sock_no_shutdown,
3636         .setsockopt     =       sock_no_setsockopt,
3637         .getsockopt     =       sock_no_getsockopt,
3638         .mmap           =       sock_no_mmap,
3639         .sendpage       =       sock_no_sendpage,
3640
3641         /* Now the operations that really occur. */
3642         .release        =       pfkey_release,
3643         .poll           =       datagram_poll,
3644         .sendmsg        =       pfkey_sendmsg,
3645         .recvmsg        =       pfkey_recvmsg,
3646 };
3647
3648 static const struct net_proto_family pfkey_family_ops = {
3649         .family =       PF_KEY,
3650         .create =       pfkey_create,
3651         .owner  =       THIS_MODULE,
3652 };
3653
3654 #ifdef CONFIG_PROC_FS
3655 static int pfkey_seq_show(struct seq_file *f, void *v)
3656 {
3657         struct sock *s = sk_entry(v);
3658
3659         if (v == SEQ_START_TOKEN)
3660                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3661         else
3662                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3663                                s,
3664                                atomic_read(&s->sk_refcnt),
3665                                sk_rmem_alloc_get(s),
3666                                sk_wmem_alloc_get(s),
3667                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3668                                sock_i_ino(s)
3669                                );
3670         return 0;
3671 }
3672
3673 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3674         __acquires(rcu)
3675 {
3676         struct net *net = seq_file_net(f);
3677         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3678
3679         rcu_read_lock();
3680         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3681 }
3682
3683 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3684 {
3685         struct net *net = seq_file_net(f);
3686         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3687
3688         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3689 }
3690
3691 static void pfkey_seq_stop(struct seq_file *f, void *v)
3692         __releases(rcu)
3693 {
3694         rcu_read_unlock();
3695 }
3696
3697 static const struct seq_operations pfkey_seq_ops = {
3698         .start  = pfkey_seq_start,
3699         .next   = pfkey_seq_next,
3700         .stop   = pfkey_seq_stop,
3701         .show   = pfkey_seq_show,
3702 };
3703
3704 static int pfkey_seq_open(struct inode *inode, struct file *file)
3705 {
3706         return seq_open_net(inode, file, &pfkey_seq_ops,
3707                             sizeof(struct seq_net_private));
3708 }
3709
3710 static const struct file_operations pfkey_proc_ops = {
3711         .open    = pfkey_seq_open,
3712         .read    = seq_read,
3713         .llseek  = seq_lseek,
3714         .release = seq_release_net,
3715 };
3716
3717 static int __net_init pfkey_init_proc(struct net *net)
3718 {
3719         struct proc_dir_entry *e;
3720
3721         e = proc_net_fops_create(net, "pfkey", 0, &pfkey_proc_ops);
3722         if (e == NULL)
3723                 return -ENOMEM;
3724
3725         return 0;
3726 }
3727
3728 static void __net_exit pfkey_exit_proc(struct net *net)
3729 {
3730         proc_net_remove(net, "pfkey");
3731 }
3732 #else
3733 static inline int pfkey_init_proc(struct net *net)
3734 {
3735         return 0;
3736 }
3737
3738 static inline void pfkey_exit_proc(struct net *net)
3739 {
3740 }
3741 #endif
3742
3743 static struct xfrm_mgr pfkeyv2_mgr =
3744 {
3745         .id             = "pfkeyv2",
3746         .notify         = pfkey_send_notify,
3747         .acquire        = pfkey_send_acquire,
3748         .compile_policy = pfkey_compile_policy,
3749         .new_mapping    = pfkey_send_new_mapping,
3750         .notify_policy  = pfkey_send_policy_notify,
3751         .migrate        = pfkey_send_migrate,
3752 };
3753
3754 static int __net_init pfkey_net_init(struct net *net)
3755 {
3756         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3757         int rv;
3758
3759         INIT_HLIST_HEAD(&net_pfkey->table);
3760         atomic_set(&net_pfkey->socks_nr, 0);
3761
3762         rv = pfkey_init_proc(net);
3763
3764         return rv;
3765 }
3766
3767 static void __net_exit pfkey_net_exit(struct net *net)
3768 {
3769         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3770
3771         pfkey_exit_proc(net);
3772         BUG_ON(!hlist_empty(&net_pfkey->table));
3773 }
3774
3775 static struct pernet_operations pfkey_net_ops = {
3776         .init = pfkey_net_init,
3777         .exit = pfkey_net_exit,
3778         .id   = &pfkey_net_id,
3779         .size = sizeof(struct netns_pfkey),
3780 };
3781
3782 static void __exit ipsec_pfkey_exit(void)
3783 {
3784         xfrm_unregister_km(&pfkeyv2_mgr);
3785         sock_unregister(PF_KEY);
3786         unregister_pernet_subsys(&pfkey_net_ops);
3787         proto_unregister(&key_proto);
3788 }
3789
3790 static int __init ipsec_pfkey_init(void)
3791 {
3792         int err = proto_register(&key_proto, 0);
3793
3794         if (err != 0)
3795                 goto out;
3796
3797         err = register_pernet_subsys(&pfkey_net_ops);
3798         if (err != 0)
3799                 goto out_unregister_key_proto;
3800         err = sock_register(&pfkey_family_ops);
3801         if (err != 0)
3802                 goto out_unregister_pernet;
3803         err = xfrm_register_km(&pfkeyv2_mgr);
3804         if (err != 0)
3805                 goto out_sock_unregister;
3806 out:
3807         return err;
3808
3809 out_sock_unregister:
3810         sock_unregister(PF_KEY);
3811 out_unregister_pernet:
3812         unregister_pernet_subsys(&pfkey_net_ops);
3813 out_unregister_key_proto:
3814         proto_unregister(&key_proto);
3815         goto out;
3816 }
3817
3818 module_init(ipsec_pfkey_init);
3819 module_exit(ipsec_pfkey_exit);
3820 MODULE_LICENSE("GPL");
3821 MODULE_ALIAS_NETPROTO(PF_KEY);