net/ieee802154/socket.c

   1 /*
   2  * IEEE802154.4 socket interface
   3  *
   4  * Copyright 2007, 2008 Siemens AG
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * Written by:
  16  * Sergey Lapin <slapin@ossfans.org>
  17  * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
  18  */
  19
  20 #include <linux/net.h>
  21 #include <linux/capability.h>
  22 #include <linux/module.h>
  23 #include <linux/if_arp.h>
  24 #include <linux/if.h>
  25 #include <linux/termios.h>      /* For TIOCOUTQ/INQ */
  26 #include <linux/list.h>
  27 #include <linux/slab.h>
  28 #include <net/datalink.h>
  29 #include <net/psnap.h>
  30 #include <net/sock.h>
  31 #include <net/tcp_states.h>
  32 #include <net/route.h>
  33
  34 #include <net/af_ieee802154.h>
  35 #include <net/ieee802154_netdev.h>
  36
  37 /* Utility function for families */
  38 static struct net_device*
  39 ieee802154_get_dev(struct net *net, const struct ieee802154_addr *addr)
  40 {
  41         struct net_device *dev = NULL;
  42         struct net_device *tmp;
  43         __le16 pan_id, short_addr;
  44         u8 hwaddr[IEEE802154_ADDR_LEN];
  45
  46         switch (addr->mode) {
  47         case IEEE802154_ADDR_LONG:
  48                 ieee802154_devaddr_to_raw(hwaddr, addr->extended_addr);
  49                 rcu_read_lock();
  50                 dev = dev_getbyhwaddr_rcu(net, ARPHRD_IEEE802154, hwaddr);
  51                 if (dev)
  52                         dev_hold(dev);
  53                 rcu_read_unlock();
  54                 break;
  55         case IEEE802154_ADDR_SHORT:
  56                 if (addr->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST) ||
  57                     addr->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
  58                     addr->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST))
  59                         break;
  60
  61                 rtnl_lock();
  62
  63                 for_each_netdev(net, tmp) {
  64                         if (tmp->type != ARPHRD_IEEE802154)
  65                                 continue;
  66
  67                         pan_id = tmp->ieee802154_ptr->pan_id;
  68                         short_addr = tmp->ieee802154_ptr->short_addr;
  69                         if (pan_id == addr->pan_id &&
  70                             short_addr == addr->short_addr) {
  71                                 dev = tmp;
  72                                 dev_hold(dev);
  73                                 break;
  74                         }
  75                 }
  76
  77                 rtnl_unlock();
  78                 break;
  79         default:
  80                 pr_warn("Unsupported ieee802154 address type: %d\n",
  81                         addr->mode);
  82                 break;
  83         }
  84
  85         return dev;
  86 }
  87
  88 static int ieee802154_sock_release(struct socket *sock)
  89 {
  90         struct sock *sk = sock->sk;
  91
  92         if (sk) {
  93                 sock->sk = NULL;
  94                 sk->sk_prot->close(sk, 0);
  95         }
  96         return 0;
  97 }
  98
  99 static int ieee802154_sock_sendmsg(struct socket *sock, struct msghdr *msg,
 100                                    size_t len)
 101 {
 102         struct sock *sk = sock->sk;
 103
 104         return sk->sk_prot->sendmsg(sk, msg, len);
 105 }
 106
 107 static int ieee802154_sock_bind(struct socket *sock, struct sockaddr *uaddr,
 108                                 int addr_len)
 109 {
 110         struct sock *sk = sock->sk;
 111
 112         if (sk->sk_prot->bind)
 113                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 114
 115         return sock_no_bind(sock, uaddr, addr_len);
 116 }
 117
 118 static int ieee802154_sock_connect(struct socket *sock, struct sockaddr *uaddr,
 119                                    int addr_len, int flags)
 120 {
 121         struct sock *sk = sock->sk;
 122
 123         if (addr_len < sizeof(uaddr->sa_family))
 124                 return -EINVAL;
 125
 126         if (uaddr->sa_family == AF_UNSPEC)
 127                 return sk->sk_prot->disconnect(sk, flags);
 128
 129         return sk->sk_prot->connect(sk, uaddr, addr_len);
 130 }
 131
 132 static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
 133                                 unsigned int cmd)
 134 {
 135         struct ifreq ifr;
 136         int ret = -ENOIOCTLCMD;
 137         struct net_device *dev;
 138
 139         if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
 140                 return -EFAULT;
 141
 142         ifr.ifr_name[IFNAMSIZ-1] = 0;
 143
 144         dev_load(sock_net(sk), ifr.ifr_name);
 145         dev = dev_get_by_name(sock_net(sk), ifr.ifr_name);
 146
 147         if (!dev)
 148                 return -ENODEV;
 149
 150         if (dev->type == ARPHRD_IEEE802154 && dev->netdev_ops->ndo_do_ioctl)
 151                 ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);
 152
 153         if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))
 154                 ret = -EFAULT;
 155         dev_put(dev);
 156
 157         return ret;
 158 }
 159
 160 static int ieee802154_sock_ioctl(struct socket *sock, unsigned int cmd,
 161                                  unsigned long arg)
 162 {
 163         struct sock *sk = sock->sk;
 164
 165         switch (cmd) {
 166         case SIOCGSTAMP:
 167                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 168         case SIOCGSTAMPNS:
 169                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 170         case SIOCGIFADDR:
 171         case SIOCSIFADDR:
 172                 return ieee802154_dev_ioctl(sk, (struct ifreq __user *)arg,
 173                                 cmd);
 174         default:
 175                 if (!sk->sk_prot->ioctl)
 176                         return -ENOIOCTLCMD;
 177                 return sk->sk_prot->ioctl(sk, cmd, arg);
 178         }
 179 }
 180
 181 /* RAW Sockets (802.15.4 created in userspace) */
 182 static HLIST_HEAD(raw_head);
 183 static DEFINE_RWLOCK(raw_lock);
 184
 185 static int raw_hash(struct sock *sk)
 186 {
 187         write_lock_bh(&raw_lock);
 188         sk_add_node(sk, &raw_head);
 189         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 190         write_unlock_bh(&raw_lock);
 191
 192         return 0;
 193 }
 194
 195 static void raw_unhash(struct sock *sk)
 196 {
 197         write_lock_bh(&raw_lock);
 198         if (sk_del_node_init(sk))
 199                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 200         write_unlock_bh(&raw_lock);
 201 }
 202
 203 static void raw_close(struct sock *sk, long timeout)
 204 {
 205         sk_common_release(sk);
 206 }
 207
 208 static int raw_bind(struct sock *sk, struct sockaddr *_uaddr, int len)
 209 {
 210         struct ieee802154_addr addr;
 211         struct sockaddr_ieee802154 *uaddr = (struct sockaddr_ieee802154 *)_uaddr;
 212         int err = 0;
 213         struct net_device *dev = NULL;
 214
 215         if (len < sizeof(*uaddr))
 216                 return -EINVAL;
 217
 218         uaddr = (struct sockaddr_ieee802154 *)_uaddr;
 219         if (uaddr->family != AF_IEEE802154)
 220                 return -EINVAL;
 221
 222         lock_sock(sk);
 223
 224         ieee802154_addr_from_sa(&addr, &uaddr->addr);
 225         dev = ieee802154_get_dev(sock_net(sk), &addr);
 226         if (!dev) {
 227                 err = -ENODEV;
 228                 goto out;
 229         }
 230
 231         sk->sk_bound_dev_if = dev->ifindex;
 232         sk_dst_reset(sk);
 233
 234         dev_put(dev);
 235 out:
 236         release_sock(sk);
 237
 238         return err;
 239 }
 240
 241 static int raw_connect(struct sock *sk, struct sockaddr *uaddr,
 242                        int addr_len)
 243 {
 244         return -ENOTSUPP;
 245 }
 246
 247 static int raw_disconnect(struct sock *sk, int flags)
 248 {
 249         return 0;
 250 }
 251
 252 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 253 {
 254         struct net_device *dev;
 255         unsigned int mtu;
 256         struct sk_buff *skb;
 257         int hlen, tlen;
 258         int err;
 259
 260         if (msg->msg_flags & MSG_OOB) {
 261                 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
 262                 return -EOPNOTSUPP;
 263         }
 264
 265         lock_sock(sk);
 266         if (!sk->sk_bound_dev_if)
 267                 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
 268         else
 269                 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
 270         release_sock(sk);
 271
 272         if (!dev) {
 273                 pr_debug("no dev\n");
 274                 err = -ENXIO;
 275                 goto out;
 276         }
 277
 278         mtu = IEEE802154_MTU;
 279         pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
 280
 281         if (size > mtu) {
 282                 pr_debug("size = %zu, mtu = %u\n", size, mtu);
 283                 err = -EMSGSIZE;
 284                 goto out_dev;
 285         }
 286
 287         hlen = LL_RESERVED_SPACE(dev);
 288         tlen = dev->needed_tailroom;
 289         skb = sock_alloc_send_skb(sk, hlen + tlen + size,
 290                                   msg->msg_flags & MSG_DONTWAIT, &err);
 291         if (!skb)
 292                 goto out_dev;
 293
 294         skb_reserve(skb, hlen);
 295
 296         skb_reset_mac_header(skb);
 297         skb_reset_network_header(skb);
 298
 299         err = memcpy_from_msg(skb_put(skb, size), msg, size);
 300         if (err < 0)
 301                 goto out_skb;
 302
 303         skb->dev = dev;
 304         skb->protocol = htons(ETH_P_IEEE802154);
 305
 306         err = dev_queue_xmit(skb);
 307         if (err > 0)
 308                 err = net_xmit_errno(err);
 309
 310         dev_put(dev);
 311
 312         return err ?: size;
 313
 314 out_skb:
 315         kfree_skb(skb);
 316 out_dev:
 317         dev_put(dev);
 318 out:
 319         return err;
 320 }
 321
 322 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 323                        int noblock, int flags, int *addr_len)
 324 {
 325         size_t copied = 0;
 326         int err = -EOPNOTSUPP;
 327         struct sk_buff *skb;
 328
 329         skb = skb_recv_datagram(sk, flags, noblock, &err);
 330         if (!skb)
 331                 goto out;
 332
 333         copied = skb->len;
 334         if (len < copied) {
 335                 msg->msg_flags |= MSG_TRUNC;
 336                 copied = len;
 337         }
 338
 339         err = skb_copy_datagram_msg(skb, 0, msg, copied);
 340         if (err)
 341                 goto done;
 342
 343         sock_recv_ts_and_drops(msg, sk, skb);
 344
 345         if (flags & MSG_TRUNC)
 346                 copied = skb->len;
 347 done:
 348         skb_free_datagram(sk, skb);
 349 out:
 350         if (err)
 351                 return err;
 352         return copied;
 353 }
 354
 355 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
 356 {
 357         skb = skb_share_check(skb, GFP_ATOMIC);
 358         if (!skb)
 359                 return NET_RX_DROP;
 360
 361         if (sock_queue_rcv_skb(sk, skb) < 0) {
 362                 kfree_skb(skb);
 363                 return NET_RX_DROP;
 364         }
 365
 366         return NET_RX_SUCCESS;
 367 }
 368
 369 static void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
 370 {
 371         struct sock *sk;
 372
 373         read_lock(&raw_lock);
 374         sk_for_each(sk, &raw_head) {
 375                 bh_lock_sock(sk);
 376                 if (!sk->sk_bound_dev_if ||
 377                     sk->sk_bound_dev_if == dev->ifindex) {
 378                         struct sk_buff *clone;
 379
 380                         clone = skb_clone(skb, GFP_ATOMIC);
 381                         if (clone)
 382                                 raw_rcv_skb(sk, clone);
 383                 }
 384                 bh_unlock_sock(sk);
 385         }
 386         read_unlock(&raw_lock);
 387 }
 388
 389 static int raw_getsockopt(struct sock *sk, int level, int optname,
 390                           char __user *optval, int __user *optlen)
 391 {
 392         return -EOPNOTSUPP;
 393 }
 394
 395 static int raw_setsockopt(struct sock *sk, int level, int optname,
 396                           char __user *optval, unsigned int optlen)
 397 {
 398         return -EOPNOTSUPP;
 399 }
 400
 401 static struct proto ieee802154_raw_prot = {
 402         .name           = "IEEE-802.15.4-RAW",
 403         .owner          = THIS_MODULE,
 404         .obj_size       = sizeof(struct sock),
 405         .close          = raw_close,
 406         .bind           = raw_bind,
 407         .sendmsg        = raw_sendmsg,
 408         .recvmsg        = raw_recvmsg,
 409         .hash           = raw_hash,
 410         .unhash         = raw_unhash,
 411         .connect        = raw_connect,
 412         .disconnect     = raw_disconnect,
 413         .getsockopt     = raw_getsockopt,
 414         .setsockopt     = raw_setsockopt,
 415 };
 416
 417 static const struct proto_ops ieee802154_raw_ops = {
 418         .family            = PF_IEEE802154,
 419         .owner             = THIS_MODULE,
 420         .release           = ieee802154_sock_release,
 421         .bind              = ieee802154_sock_bind,
 422         .connect           = ieee802154_sock_connect,
 423         .socketpair        = sock_no_socketpair,
 424         .accept            = sock_no_accept,
 425         .getname           = sock_no_getname,
 426         .poll              = datagram_poll,
 427         .ioctl             = ieee802154_sock_ioctl,
 428         .listen            = sock_no_listen,
 429         .shutdown          = sock_no_shutdown,
 430         .setsockopt        = sock_common_setsockopt,
 431         .getsockopt        = sock_common_getsockopt,
 432         .sendmsg           = ieee802154_sock_sendmsg,
 433         .recvmsg           = sock_common_recvmsg,
 434         .mmap              = sock_no_mmap,
 435         .sendpage          = sock_no_sendpage,
 436 #ifdef CONFIG_COMPAT
 437         .compat_setsockopt = compat_sock_common_setsockopt,
 438         .compat_getsockopt = compat_sock_common_getsockopt,
 439 #endif
 440 };
 441
 442 /* DGRAM Sockets (802.15.4 dataframes) */
 443 static HLIST_HEAD(dgram_head);
 444 static DEFINE_RWLOCK(dgram_lock);
 445
 446 struct dgram_sock {
 447         struct sock sk;
 448
 449         struct ieee802154_addr src_addr;
 450         struct ieee802154_addr dst_addr;
 451
 452         unsigned int bound:1;
 453         unsigned int connected:1;
 454         unsigned int want_ack:1;
 455         unsigned int secen:1;
 456         unsigned int secen_override:1;
 457         unsigned int seclevel:3;
 458         unsigned int seclevel_override:1;
 459 };
 460
 461 static inline struct dgram_sock *dgram_sk(const struct sock *sk)
 462 {
 463         return container_of(sk, struct dgram_sock, sk);
 464 }
 465
 466 static int dgram_hash(struct sock *sk)
 467 {
 468         write_lock_bh(&dgram_lock);
 469         sk_add_node(sk, &dgram_head);
 470         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 471         write_unlock_bh(&dgram_lock);
 472
 473         return 0;
 474 }
 475
 476 static void dgram_unhash(struct sock *sk)
 477 {
 478         write_lock_bh(&dgram_lock);
 479         if (sk_del_node_init(sk))
 480                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 481         write_unlock_bh(&dgram_lock);
 482 }
 483
 484 static int dgram_init(struct sock *sk)
 485 {
 486         struct dgram_sock *ro = dgram_sk(sk);
 487
 488         ro->want_ack = 1;
 489         return 0;
 490 }
 491
 492 static void dgram_close(struct sock *sk, long timeout)
 493 {
 494         sk_common_release(sk);
 495 }
 496
 497 static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
 498 {
 499         struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
 500         struct ieee802154_addr haddr;
 501         struct dgram_sock *ro = dgram_sk(sk);
 502         int err = -EINVAL;
 503         struct net_device *dev;
 504
 505         lock_sock(sk);
 506
 507         ro->bound = 0;
 508
 509         if (len < sizeof(*addr))
 510                 goto out;
 511
 512         if (addr->family != AF_IEEE802154)
 513                 goto out;
 514
 515         ieee802154_addr_from_sa(&haddr, &addr->addr);
 516         dev = ieee802154_get_dev(sock_net(sk), &haddr);
 517         if (!dev) {
 518                 err = -ENODEV;
 519                 goto out;
 520         }
 521
 522         if (dev->type != ARPHRD_IEEE802154) {
 523                 err = -ENODEV;
 524                 goto out_put;
 525         }
 526
 527         ro->src_addr = haddr;
 528
 529         ro->bound = 1;
 530         err = 0;
 531 out_put:
 532         dev_put(dev);
 533 out:
 534         release_sock(sk);
 535
 536         return err;
 537 }
 538
 539 static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
 540 {
 541         switch (cmd) {
 542         case SIOCOUTQ:
 543         {
 544                 int amount = sk_wmem_alloc_get(sk);
 545
 546                 return put_user(amount, (int __user *)arg);
 547         }
 548
 549         case SIOCINQ:
 550         {
 551                 struct sk_buff *skb;
 552                 unsigned long amount;
 553
 554                 amount = 0;
 555                 spin_lock_bh(&sk->sk_receive_queue.lock);
 556                 skb = skb_peek(&sk->sk_receive_queue);
 557                 if (skb) {
 558                         /* We will only return the amount
 559                          * of this packet since that is all
 560                          * that will be read.
 561                          */
 562                         amount = skb->len - ieee802154_hdr_length(skb);
 563                 }
 564                 spin_unlock_bh(&sk->sk_receive_queue.lock);
 565                 return put_user(amount, (int __user *)arg);
 566         }
 567         }
 568
 569         return -ENOIOCTLCMD;
 570 }
 571
 572 /* FIXME: autobind */
 573 static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
 574                          int len)
 575 {
 576         struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
 577         struct dgram_sock *ro = dgram_sk(sk);
 578         int err = 0;
 579
 580         if (len < sizeof(*addr))
 581                 return -EINVAL;
 582
 583         if (addr->family != AF_IEEE802154)
 584                 return -EINVAL;
 585
 586         lock_sock(sk);
 587
 588         if (!ro->bound) {
 589                 err = -ENETUNREACH;
 590                 goto out;
 591         }
 592
 593         ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);
 594         ro->connected = 1;
 595
 596 out:
 597         release_sock(sk);
 598         return err;
 599 }
 600
 601 static int dgram_disconnect(struct sock *sk, int flags)
 602 {
 603         struct dgram_sock *ro = dgram_sk(sk);
 604
 605         lock_sock(sk);
 606         ro->connected = 0;
 607         release_sock(sk);
 608
 609         return 0;
 610 }
 611
 612 static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 613 {
 614         struct net_device *dev;
 615         unsigned int mtu;
 616         struct sk_buff *skb;
 617         struct ieee802154_mac_cb *cb;
 618         struct dgram_sock *ro = dgram_sk(sk);
 619         struct ieee802154_addr dst_addr;
 620         int hlen, tlen;
 621         int err;
 622
 623         if (msg->msg_flags & MSG_OOB) {
 624                 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
 625                 return -EOPNOTSUPP;
 626         }
 627
 628         if (!ro->connected && !msg->msg_name)
 629                 return -EDESTADDRREQ;
 630         else if (ro->connected && msg->msg_name)
 631                 return -EISCONN;
 632
 633         if (!ro->bound)
 634                 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
 635         else
 636                 dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
 637
 638         if (!dev) {
 639                 pr_debug("no dev\n");
 640                 err = -ENXIO;
 641                 goto out;
 642         }
 643         mtu = IEEE802154_MTU;
 644         pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
 645
 646         if (size > mtu) {
 647                 pr_debug("size = %zu, mtu = %u\n", size, mtu);
 648                 err = -EMSGSIZE;
 649                 goto out_dev;
 650         }
 651
 652         hlen = LL_RESERVED_SPACE(dev);
 653         tlen = dev->needed_tailroom;
 654         skb = sock_alloc_send_skb(sk, hlen + tlen + size,
 655                                   msg->msg_flags & MSG_DONTWAIT,
 656                                   &err);
 657         if (!skb)
 658                 goto out_dev;
 659
 660         skb_reserve(skb, hlen);
 661
 662         skb_reset_network_header(skb);
 663
 664         cb = mac_cb_init(skb);
 665         cb->type = IEEE802154_FC_TYPE_DATA;
 666         cb->ackreq = ro->want_ack;
 667
 668         if (msg->msg_name) {
 669                 DECLARE_SOCKADDR(struct sockaddr_ieee802154*,
 670                                  daddr, msg->msg_name);
 671
 672                 ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
 673         } else {
 674                 dst_addr = ro->dst_addr;
 675         }
 676
 677         cb->secen = ro->secen;
 678         cb->secen_override = ro->secen_override;
 679         cb->seclevel = ro->seclevel;
 680         cb->seclevel_override = ro->seclevel_override;
 681
 682         err = wpan_dev_hard_header(skb, dev, &dst_addr,
 683                                    ro->bound ? &ro->src_addr : NULL, size);
 684         if (err < 0)
 685                 goto out_skb;
 686
 687         err = memcpy_from_msg(skb_put(skb, size), msg, size);
 688         if (err < 0)
 689                 goto out_skb;
 690
 691         skb->dev = dev;
 692         skb->protocol = htons(ETH_P_IEEE802154);
 693
 694         err = dev_queue_xmit(skb);
 695         if (err > 0)
 696                 err = net_xmit_errno(err);
 697
 698         dev_put(dev);
 699
 700         return err ?: size;
 701
 702 out_skb:
 703         kfree_skb(skb);
 704 out_dev:
 705         dev_put(dev);
 706 out:
 707         return err;
 708 }
 709
 710 static int dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 711                          int noblock, int flags, int *addr_len)
 712 {
 713         size_t copied = 0;
 714         int err = -EOPNOTSUPP;
 715         struct sk_buff *skb;
 716         DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
 717
 718         skb = skb_recv_datagram(sk, flags, noblock, &err);
 719         if (!skb)
 720                 goto out;
 721
 722         copied = skb->len;
 723         if (len < copied) {
 724                 msg->msg_flags |= MSG_TRUNC;
 725                 copied = len;
 726         }
 727
 728         /* FIXME: skip headers if necessary ?! */
 729         err = skb_copy_datagram_msg(skb, 0, msg, copied);
 730         if (err)
 731                 goto done;
 732
 733         sock_recv_ts_and_drops(msg, sk, skb);
 734
 735         if (saddr) {
 736                 /* Clear the implicit padding in struct sockaddr_ieee802154
 737                  * (16 bits between 'family' and 'addr') and in struct
 738                  * ieee802154_addr_sa (16 bits at the end of the structure).
 739                  */
 740                 memset(saddr, 0, sizeof(*saddr));
 741
 742                 saddr->family = AF_IEEE802154;
 743                 ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
 744                 *addr_len = sizeof(*saddr);
 745         }
 746
 747         if (flags & MSG_TRUNC)
 748                 copied = skb->len;
 749 done:
 750         skb_free_datagram(sk, skb);
 751 out:
 752         if (err)
 753                 return err;
 754         return copied;
 755 }
 756
 757 static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
 758 {
 759         skb = skb_share_check(skb, GFP_ATOMIC);
 760         if (!skb)
 761                 return NET_RX_DROP;
 762
 763         if (sock_queue_rcv_skb(sk, skb) < 0) {
 764                 kfree_skb(skb);
 765                 return NET_RX_DROP;
 766         }
 767
 768         return NET_RX_SUCCESS;
 769 }
 770
 771 static inline bool
 772 ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
 773                       struct dgram_sock *ro)
 774 {
 775         if (!ro->bound)
 776                 return true;
 777
 778         if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
 779             hw_addr == ro->src_addr.extended_addr)
 780                 return true;
 781
 782         if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
 783             pan_id == ro->src_addr.pan_id &&
 784             short_addr == ro->src_addr.short_addr)
 785                 return true;
 786
 787         return false;
 788 }
 789
 790 static int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
 791 {
 792         struct sock *sk, *prev = NULL;
 793         int ret = NET_RX_SUCCESS;
 794         __le16 pan_id, short_addr;
 795         __le64 hw_addr;
 796
 797         /* Data frame processing */
 798         BUG_ON(dev->type != ARPHRD_IEEE802154);
 799
 800         pan_id = dev->ieee802154_ptr->pan_id;
 801         short_addr = dev->ieee802154_ptr->short_addr;
 802         hw_addr = dev->ieee802154_ptr->extended_addr;
 803
 804         read_lock(&dgram_lock);
 805         sk_for_each(sk, &dgram_head) {
 806                 if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
 807                                           dgram_sk(sk))) {
 808                         if (prev) {
 809                                 struct sk_buff *clone;
 810
 811                                 clone = skb_clone(skb, GFP_ATOMIC);
 812                                 if (clone)
 813                                         dgram_rcv_skb(prev, clone);
 814                         }
 815
 816                         prev = sk;
 817                 }
 818         }
 819
 820         if (prev) {
 821                 dgram_rcv_skb(prev, skb);
 822         } else {
 823                 kfree_skb(skb);
 824                 ret = NET_RX_DROP;
 825         }
 826         read_unlock(&dgram_lock);
 827
 828         return ret;
 829 }
 830
 831 static int dgram_getsockopt(struct sock *sk, int level, int optname,
 832                             char __user *optval, int __user *optlen)
 833 {
 834         struct dgram_sock *ro = dgram_sk(sk);
 835
 836         int val, len;
 837
 838         if (level != SOL_IEEE802154)
 839                 return -EOPNOTSUPP;
 840
 841         if (get_user(len, optlen))
 842                 return -EFAULT;
 843
 844         len = min_t(unsigned int, len, sizeof(int));
 845
 846         switch (optname) {
 847         case WPAN_WANTACK:
 848                 val = ro->want_ack;
 849                 break;
 850         case WPAN_SECURITY:
 851                 if (!ro->secen_override)
 852                         val = WPAN_SECURITY_DEFAULT;
 853                 else if (ro->secen)
 854                         val = WPAN_SECURITY_ON;
 855                 else
 856                         val = WPAN_SECURITY_OFF;
 857                 break;
 858         case WPAN_SECURITY_LEVEL:
 859                 if (!ro->seclevel_override)
 860                         val = WPAN_SECURITY_LEVEL_DEFAULT;
 861                 else
 862                         val = ro->seclevel;
 863                 break;
 864         default:
 865                 return -ENOPROTOOPT;
 866         }
 867
 868         if (put_user(len, optlen))
 869                 return -EFAULT;
 870         if (copy_to_user(optval, &val, len))
 871                 return -EFAULT;
 872         return 0;
 873 }
 874
 875 static int dgram_setsockopt(struct sock *sk, int level, int optname,
 876                             char __user *optval, unsigned int optlen)
 877 {
 878         struct dgram_sock *ro = dgram_sk(sk);
 879         struct net *net = sock_net(sk);
 880         int val;
 881         int err = 0;
 882
 883         if (optlen < sizeof(int))
 884                 return -EINVAL;
 885
 886         if (get_user(val, (int __user *)optval))
 887                 return -EFAULT;
 888
 889         lock_sock(sk);
 890
 891         switch (optname) {
 892         case WPAN_WANTACK:
 893                 ro->want_ack = !!val;
 894                 break;
 895         case WPAN_SECURITY:
 896                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 897                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 898                         err = -EPERM;
 899                         break;
 900                 }
 901
 902                 switch (val) {
 903                 case WPAN_SECURITY_DEFAULT:
 904                         ro->secen_override = 0;
 905                         break;
 906                 case WPAN_SECURITY_ON:
 907                         ro->secen_override = 1;
 908                         ro->secen = 1;
 909                         break;
 910                 case WPAN_SECURITY_OFF:
 911                         ro->secen_override = 1;
 912                         ro->secen = 0;
 913                         break;
 914                 default:
 915                         err = -EINVAL;
 916                         break;
 917                 }
 918                 break;
 919         case WPAN_SECURITY_LEVEL:
 920                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 921                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 922                         err = -EPERM;
 923                         break;
 924                 }
 925
 926                 if (val < WPAN_SECURITY_LEVEL_DEFAULT ||
 927                     val > IEEE802154_SCF_SECLEVEL_ENC_MIC128) {
 928                         err = -EINVAL;
 929                 } else if (val == WPAN_SECURITY_LEVEL_DEFAULT) {
 930                         ro->seclevel_override = 0;
 931                 } else {
 932                         ro->seclevel_override = 1;
 933                         ro->seclevel = val;
 934                 }
 935                 break;
 936         default:
 937                 err = -ENOPROTOOPT;
 938                 break;
 939         }
 940
 941         release_sock(sk);
 942         return err;
 943 }
 944
 945 static struct proto ieee802154_dgram_prot = {
 946         .name           = "IEEE-802.15.4-MAC",
 947         .owner          = THIS_MODULE,
 948         .obj_size       = sizeof(struct dgram_sock),
 949         .init           = dgram_init,
 950         .close          = dgram_close,
 951         .bind           = dgram_bind,
 952         .sendmsg        = dgram_sendmsg,
 953         .recvmsg        = dgram_recvmsg,
 954         .hash           = dgram_hash,
 955         .unhash         = dgram_unhash,
 956         .connect        = dgram_connect,
 957         .disconnect     = dgram_disconnect,
 958         .ioctl          = dgram_ioctl,
 959         .getsockopt     = dgram_getsockopt,
 960         .setsockopt     = dgram_setsockopt,
 961 };
 962
 963 static const struct proto_ops ieee802154_dgram_ops = {
 964         .family            = PF_IEEE802154,
 965         .owner             = THIS_MODULE,
 966         .release           = ieee802154_sock_release,
 967         .bind              = ieee802154_sock_bind,
 968         .connect           = ieee802154_sock_connect,
 969         .socketpair        = sock_no_socketpair,
 970         .accept            = sock_no_accept,
 971         .getname           = sock_no_getname,
 972         .poll              = datagram_poll,
 973         .ioctl             = ieee802154_sock_ioctl,
 974         .listen            = sock_no_listen,
 975         .shutdown          = sock_no_shutdown,
 976         .setsockopt        = sock_common_setsockopt,
 977         .getsockopt        = sock_common_getsockopt,
 978         .sendmsg           = ieee802154_sock_sendmsg,
 979         .recvmsg           = sock_common_recvmsg,
 980         .mmap              = sock_no_mmap,
 981         .sendpage          = sock_no_sendpage,
 982 #ifdef CONFIG_COMPAT
 983         .compat_setsockopt = compat_sock_common_setsockopt,
 984         .compat_getsockopt = compat_sock_common_getsockopt,
 985 #endif
 986 };
 987
 988 /* Create a socket. Initialise the socket, blank the addresses
 989  * set the state.
 990  */
 991 static int ieee802154_create(struct net *net, struct socket *sock,
 992                              int protocol, int kern)
 993 {
 994         struct sock *sk;
 995         int rc;
 996         struct proto *proto;
 997         const struct proto_ops *ops;
 998
 999         if (!net_eq(net, &init_net))
1000                 return -EAFNOSUPPORT;
1001
1002         switch (sock->type) {
1003         case SOCK_RAW:
1004                 rc = -EPERM;
1005                 if (!capable(CAP_NET_RAW))
1006                         goto out;
1007                 proto = &ieee802154_raw_prot;
1008                 ops = &ieee802154_raw_ops;
1009                 break;
1010         case SOCK_DGRAM:
1011                 proto = &ieee802154_dgram_prot;
1012                 ops = &ieee802154_dgram_ops;
1013                 break;
1014         default:
1015                 rc = -ESOCKTNOSUPPORT;
1016                 goto out;
1017         }
1018
1019         rc = -ENOMEM;
1020         sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto, kern);
1021         if (!sk)
1022                 goto out;
1023         rc = 0;
1024
1025         sock->ops = ops;
1026
1027         sock_init_data(sock, sk);
1028         /* FIXME: sk->sk_destruct */
1029         sk->sk_family = PF_IEEE802154;
1030
1031         /* Checksums on by default */
1032         sock_set_flag(sk, SOCK_ZAPPED);
1033
1034         if (sk->sk_prot->hash) {
1035                 rc = sk->sk_prot->hash(sk);
1036                 if (rc) {
1037                         sk_common_release(sk);
1038                         goto out;
1039                 }
1040         }
1041
1042         if (sk->sk_prot->init) {
1043                 rc = sk->sk_prot->init(sk);
1044                 if (rc)
1045                         sk_common_release(sk);
1046         }
1047 out:
1048         return rc;
1049 }
1050
1051 static const struct net_proto_family ieee802154_family_ops = {
1052         .family         = PF_IEEE802154,
1053         .create         = ieee802154_create,
1054         .owner          = THIS_MODULE,
1055 };
1056
1057 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
1058                           struct packet_type *pt, struct net_device *orig_dev)
1059 {
1060         if (!netif_running(dev))
1061                 goto drop;
1062         pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
1063 #ifdef DEBUG
1064         print_hex_dump_bytes("ieee802154_rcv ",
1065                              DUMP_PREFIX_NONE, skb->data, skb->len);
1066 #endif
1067
1068         if (!net_eq(dev_net(dev), &init_net))
1069                 goto drop;
1070
1071         ieee802154_raw_deliver(dev, skb);
1072
1073         if (dev->type != ARPHRD_IEEE802154)
1074                 goto drop;
1075
1076         if (skb->pkt_type != PACKET_OTHERHOST)
1077                 return ieee802154_dgram_deliver(dev, skb);
1078
1079 drop:
1080         kfree_skb(skb);
1081         return NET_RX_DROP;
1082 }
1083
1084 static struct packet_type ieee802154_packet_type = {
1085         .type = htons(ETH_P_IEEE802154),
1086         .func = ieee802154_rcv,
1087 };
1088
1089 static int __init af_ieee802154_init(void)
1090 {
1091         int rc = -EINVAL;
1092
1093         rc = proto_register(&ieee802154_raw_prot, 1);
1094         if (rc)
1095                 goto out;
1096
1097         rc = proto_register(&ieee802154_dgram_prot, 1);
1098         if (rc)
1099                 goto err_dgram;
1100
1101         /* Tell SOCKET that we are alive */
1102         rc = sock_register(&ieee802154_family_ops);
1103         if (rc)
1104                 goto err_sock;
1105         dev_add_pack(&ieee802154_packet_type);
1106
1107         rc = 0;
1108         goto out;
1109
1110 err_sock:
1111         proto_unregister(&ieee802154_dgram_prot);
1112 err_dgram:
1113         proto_unregister(&ieee802154_raw_prot);
1114 out:
1115         return rc;
1116 }
1117
1118 static void __exit af_ieee802154_remove(void)
1119 {
1120         dev_remove_pack(&ieee802154_packet_type);
1121         sock_unregister(PF_IEEE802154);
1122         proto_unregister(&ieee802154_dgram_prot);
1123         proto_unregister(&ieee802154_raw_prot);
1124 }
1125
1126 module_init(af_ieee802154_init);
1127 module_exit(af_ieee802154_remove);
1128
1129 MODULE_LICENSE("GPL");
1130 MODULE_ALIAS_NETPROTO(PF_IEEE802154);