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 <linux/socket.h>
  29 #include <net/datalink.h>
  30 #include <net/psnap.h>
  31 #include <net/sock.h>
  32 #include <net/tcp_states.h>
  33 #include <net/route.h>
  34
  35 #include <net/af_ieee802154.h>
  36 #include <net/ieee802154_netdev.h>
  37
  38 /* Utility function for families */
  39 static struct net_device*
  40 ieee802154_get_dev(struct net *net, const struct ieee802154_addr *addr)
  41 {
  42         struct net_device *dev = NULL;
  43         struct net_device *tmp;
  44         __le16 pan_id, short_addr;
  45         u8 hwaddr[IEEE802154_ADDR_LEN];
  46
  47         switch (addr->mode) {
  48         case IEEE802154_ADDR_LONG:
  49                 ieee802154_devaddr_to_raw(hwaddr, addr->extended_addr);
  50                 rcu_read_lock();
  51                 dev = dev_getbyhwaddr_rcu(net, ARPHRD_IEEE802154, hwaddr);
  52                 if (dev)
  53                         dev_hold(dev);
  54                 rcu_read_unlock();
  55                 break;
  56         case IEEE802154_ADDR_SHORT:
  57                 if (addr->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST) ||
  58                     addr->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
  59                     addr->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST))
  60                         break;
  61
  62                 rtnl_lock();
  63
  64                 for_each_netdev(net, tmp) {
  65                         if (tmp->type != ARPHRD_IEEE802154)
  66                                 continue;
  67
  68                         pan_id = tmp->ieee802154_ptr->pan_id;
  69                         short_addr = tmp->ieee802154_ptr->short_addr;
  70                         if (pan_id == addr->pan_id &&
  71                             short_addr == addr->short_addr) {
  72                                 dev = tmp;
  73                                 dev_hold(dev);
  74                                 break;
  75                         }
  76                 }
  77
  78                 rtnl_unlock();
  79                 break;
  80         default:
  81                 pr_warn("Unsupported ieee802154 address type: %d\n",
  82                         addr->mode);
  83                 break;
  84         }
  85
  86         return dev;
  87 }
  88
  89 static int ieee802154_sock_release(struct socket *sock)
  90 {
  91         struct sock *sk = sock->sk;
  92
  93         if (sk) {
  94                 sock->sk = NULL;
  95                 sk->sk_prot->close(sk, 0);
  96         }
  97         return 0;
  98 }
  99
 100 static int ieee802154_sock_sendmsg(struct socket *sock, struct msghdr *msg,
 101                                    size_t len)
 102 {
 103         struct sock *sk = sock->sk;
 104
 105         return sk->sk_prot->sendmsg(sk, msg, len);
 106 }
 107
 108 static int ieee802154_sock_bind(struct socket *sock, struct sockaddr *uaddr,
 109                                 int addr_len)
 110 {
 111         struct sock *sk = sock->sk;
 112
 113         if (sk->sk_prot->bind)
 114                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 115
 116         return sock_no_bind(sock, uaddr, addr_len);
 117 }
 118
 119 static int ieee802154_sock_connect(struct socket *sock, struct sockaddr *uaddr,
 120                                    int addr_len, int flags)
 121 {
 122         struct sock *sk = sock->sk;
 123
 124         if (addr_len < sizeof(uaddr->sa_family))
 125                 return -EINVAL;
 126
 127         if (uaddr->sa_family == AF_UNSPEC)
 128                 return sk->sk_prot->disconnect(sk, flags);
 129
 130         return sk->sk_prot->connect(sk, uaddr, addr_len);
 131 }
 132
 133 static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
 134                                 unsigned int cmd)
 135 {
 136         struct ifreq ifr;
 137         int ret = -ENOIOCTLCMD;
 138         struct net_device *dev;
 139
 140         if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
 141                 return -EFAULT;
 142
 143         ifr.ifr_name[IFNAMSIZ-1] = 0;
 144
 145         dev_load(sock_net(sk), ifr.ifr_name);
 146         dev = dev_get_by_name(sock_net(sk), ifr.ifr_name);
 147
 148         if (!dev)
 149                 return -ENODEV;
 150
 151         if (dev->type == ARPHRD_IEEE802154 && dev->netdev_ops->ndo_do_ioctl)
 152                 ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);
 153
 154         if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))
 155                 ret = -EFAULT;
 156         dev_put(dev);
 157
 158         return ret;
 159 }
 160
 161 static int ieee802154_sock_ioctl(struct socket *sock, unsigned int cmd,
 162                                  unsigned long arg)
 163 {
 164         struct sock *sk = sock->sk;
 165
 166         switch (cmd) {
 167         case SIOCGIFADDR:
 168         case SIOCSIFADDR:
 169                 return ieee802154_dev_ioctl(sk, (struct ifreq __user *)arg,
 170                                 cmd);
 171         default:
 172                 if (!sk->sk_prot->ioctl)
 173                         return -ENOIOCTLCMD;
 174                 return sk->sk_prot->ioctl(sk, cmd, arg);
 175         }
 176 }
 177
 178 /* RAW Sockets (802.15.4 created in userspace) */
 179 static HLIST_HEAD(raw_head);
 180 static DEFINE_RWLOCK(raw_lock);
 181
 182 static int raw_hash(struct sock *sk)
 183 {
 184         write_lock_bh(&raw_lock);
 185         sk_add_node(sk, &raw_head);
 186         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 187         write_unlock_bh(&raw_lock);
 188
 189         return 0;
 190 }
 191
 192 static void raw_unhash(struct sock *sk)
 193 {
 194         write_lock_bh(&raw_lock);
 195         if (sk_del_node_init(sk))
 196                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 197         write_unlock_bh(&raw_lock);
 198 }
 199
 200 static void raw_close(struct sock *sk, long timeout)
 201 {
 202         sk_common_release(sk);
 203 }
 204
 205 static int raw_bind(struct sock *sk, struct sockaddr *_uaddr, int len)
 206 {
 207         struct ieee802154_addr addr;
 208         struct sockaddr_ieee802154 *uaddr = (struct sockaddr_ieee802154 *)_uaddr;
 209         int err = 0;
 210         struct net_device *dev = NULL;
 211
 212         if (len < sizeof(*uaddr))
 213                 return -EINVAL;
 214
 215         uaddr = (struct sockaddr_ieee802154 *)_uaddr;
 216         if (uaddr->family != AF_IEEE802154)
 217                 return -EINVAL;
 218
 219         lock_sock(sk);
 220
 221         ieee802154_addr_from_sa(&addr, &uaddr->addr);
 222         dev = ieee802154_get_dev(sock_net(sk), &addr);
 223         if (!dev) {
 224                 err = -ENODEV;
 225                 goto out;
 226         }
 227
 228         sk->sk_bound_dev_if = dev->ifindex;
 229         sk_dst_reset(sk);
 230
 231         dev_put(dev);
 232 out:
 233         release_sock(sk);
 234
 235         return err;
 236 }
 237
 238 static int raw_connect(struct sock *sk, struct sockaddr *uaddr,
 239                        int addr_len)
 240 {
 241         return -ENOTSUPP;
 242 }
 243
 244 static int raw_disconnect(struct sock *sk, int flags)
 245 {
 246         return 0;
 247 }
 248
 249 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 250 {
 251         struct net_device *dev;
 252         unsigned int mtu;
 253         struct sk_buff *skb;
 254         int hlen, tlen;
 255         int err;
 256
 257         if (msg->msg_flags & MSG_OOB) {
 258                 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
 259                 return -EOPNOTSUPP;
 260         }
 261
 262         lock_sock(sk);
 263         if (!sk->sk_bound_dev_if)
 264                 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
 265         else
 266                 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
 267         release_sock(sk);
 268
 269         if (!dev) {
 270                 pr_debug("no dev\n");
 271                 err = -ENXIO;
 272                 goto out;
 273         }
 274
 275         mtu = IEEE802154_MTU;
 276         pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
 277
 278         if (size > mtu) {
 279                 pr_debug("size = %zu, mtu = %u\n", size, mtu);
 280                 err = -EMSGSIZE;
 281                 goto out_dev;
 282         }
 283
 284         hlen = LL_RESERVED_SPACE(dev);
 285         tlen = dev->needed_tailroom;
 286         skb = sock_alloc_send_skb(sk, hlen + tlen + size,
 287                                   msg->msg_flags & MSG_DONTWAIT, &err);
 288         if (!skb)
 289                 goto out_dev;
 290
 291         skb_reserve(skb, hlen);
 292
 293         skb_reset_mac_header(skb);
 294         skb_reset_network_header(skb);
 295
 296         err = memcpy_from_msg(skb_put(skb, size), msg, size);
 297         if (err < 0)
 298                 goto out_skb;
 299
 300         skb->dev = dev;
 301         skb->protocol = htons(ETH_P_IEEE802154);
 302
 303         err = dev_queue_xmit(skb);
 304         if (err > 0)
 305                 err = net_xmit_errno(err);
 306
 307         dev_put(dev);
 308
 309         return err ?: size;
 310
 311 out_skb:
 312         kfree_skb(skb);
 313 out_dev:
 314         dev_put(dev);
 315 out:
 316         return err;
 317 }
 318
 319 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 320                        int noblock, int flags, int *addr_len)
 321 {
 322         size_t copied = 0;
 323         int err = -EOPNOTSUPP;
 324         struct sk_buff *skb;
 325
 326         skb = skb_recv_datagram(sk, flags, noblock, &err);
 327         if (!skb)
 328                 goto out;
 329
 330         copied = skb->len;
 331         if (len < copied) {
 332                 msg->msg_flags |= MSG_TRUNC;
 333                 copied = len;
 334         }
 335
 336         err = skb_copy_datagram_msg(skb, 0, msg, copied);
 337         if (err)
 338                 goto done;
 339
 340         sock_recv_ts_and_drops(msg, sk, skb);
 341
 342         if (flags & MSG_TRUNC)
 343                 copied = skb->len;
 344 done:
 345         skb_free_datagram(sk, skb);
 346 out:
 347         if (err)
 348                 return err;
 349         return copied;
 350 }
 351
 352 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
 353 {
 354         skb = skb_share_check(skb, GFP_ATOMIC);
 355         if (!skb)
 356                 return NET_RX_DROP;
 357
 358         if (sock_queue_rcv_skb(sk, skb) < 0) {
 359                 kfree_skb(skb);
 360                 return NET_RX_DROP;
 361         }
 362
 363         return NET_RX_SUCCESS;
 364 }
 365
 366 static void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
 367 {
 368         struct sock *sk;
 369
 370         read_lock(&raw_lock);
 371         sk_for_each(sk, &raw_head) {
 372                 bh_lock_sock(sk);
 373                 if (!sk->sk_bound_dev_if ||
 374                     sk->sk_bound_dev_if == dev->ifindex) {
 375                         struct sk_buff *clone;
 376
 377                         clone = skb_clone(skb, GFP_ATOMIC);
 378                         if (clone)
 379                                 raw_rcv_skb(sk, clone);
 380                 }
 381                 bh_unlock_sock(sk);
 382         }
 383         read_unlock(&raw_lock);
 384 }
 385
 386 static int raw_getsockopt(struct sock *sk, int level, int optname,
 387                           char __user *optval, int __user *optlen)
 388 {
 389         return -EOPNOTSUPP;
 390 }
 391
 392 static int raw_setsockopt(struct sock *sk, int level, int optname,
 393                           char __user *optval, unsigned int optlen)
 394 {
 395         return -EOPNOTSUPP;
 396 }
 397
 398 static struct proto ieee802154_raw_prot = {
 399         .name           = "IEEE-802.15.4-RAW",
 400         .owner          = THIS_MODULE,
 401         .obj_size       = sizeof(struct sock),
 402         .close          = raw_close,
 403         .bind           = raw_bind,
 404         .sendmsg        = raw_sendmsg,
 405         .recvmsg        = raw_recvmsg,
 406         .hash           = raw_hash,
 407         .unhash         = raw_unhash,
 408         .connect        = raw_connect,
 409         .disconnect     = raw_disconnect,
 410         .getsockopt     = raw_getsockopt,
 411         .setsockopt     = raw_setsockopt,
 412 };
 413
 414 static const struct proto_ops ieee802154_raw_ops = {
 415         .family            = PF_IEEE802154,
 416         .owner             = THIS_MODULE,
 417         .release           = ieee802154_sock_release,
 418         .bind              = ieee802154_sock_bind,
 419         .connect           = ieee802154_sock_connect,
 420         .socketpair        = sock_no_socketpair,
 421         .accept            = sock_no_accept,
 422         .getname           = sock_no_getname,
 423         .poll              = datagram_poll,
 424         .ioctl             = ieee802154_sock_ioctl,
 425         .gettstamp         = sock_gettstamp,
 426         .listen            = sock_no_listen,
 427         .shutdown          = sock_no_shutdown,
 428         .setsockopt        = sock_common_setsockopt,
 429         .getsockopt        = sock_common_getsockopt,
 430         .sendmsg           = ieee802154_sock_sendmsg,
 431         .recvmsg           = sock_common_recvmsg,
 432         .mmap              = sock_no_mmap,
 433         .sendpage          = sock_no_sendpage,
 434 #ifdef CONFIG_COMPAT
 435         .compat_setsockopt = compat_sock_common_setsockopt,
 436         .compat_getsockopt = compat_sock_common_getsockopt,
 437 #endif
 438 };
 439
 440 /* DGRAM Sockets (802.15.4 dataframes) */
 441 static HLIST_HEAD(dgram_head);
 442 static DEFINE_RWLOCK(dgram_lock);
 443
 444 struct dgram_sock {
 445         struct sock sk;
 446
 447         struct ieee802154_addr src_addr;
 448         struct ieee802154_addr dst_addr;
 449
 450         unsigned int bound:1;
 451         unsigned int connected:1;
 452         unsigned int want_ack:1;
 453         unsigned int want_lqi:1;
 454         unsigned int secen:1;
 455         unsigned int secen_override:1;
 456         unsigned int seclevel:3;
 457         unsigned int seclevel_override:1;
 458 };
 459
 460 static inline struct dgram_sock *dgram_sk(const struct sock *sk)
 461 {
 462         return container_of(sk, struct dgram_sock, sk);
 463 }
 464
 465 static int dgram_hash(struct sock *sk)
 466 {
 467         write_lock_bh(&dgram_lock);
 468         sk_add_node(sk, &dgram_head);
 469         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 470         write_unlock_bh(&dgram_lock);
 471
 472         return 0;
 473 }
 474
 475 static void dgram_unhash(struct sock *sk)
 476 {
 477         write_lock_bh(&dgram_lock);
 478         if (sk_del_node_init(sk))
 479                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 480         write_unlock_bh(&dgram_lock);
 481 }
 482
 483 static int dgram_init(struct sock *sk)
 484 {
 485         struct dgram_sock *ro = dgram_sk(sk);
 486
 487         ro->want_ack = 1;
 488         ro->want_lqi = 0;
 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         struct dgram_sock *ro = dgram_sk(sk);
 717         DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
 718
 719         skb = skb_recv_datagram(sk, flags, noblock, &err);
 720         if (!skb)
 721                 goto out;
 722
 723         copied = skb->len;
 724         if (len < copied) {
 725                 msg->msg_flags |= MSG_TRUNC;
 726                 copied = len;
 727         }
 728
 729         /* FIXME: skip headers if necessary ?! */
 730         err = skb_copy_datagram_msg(skb, 0, msg, copied);
 731         if (err)
 732                 goto done;
 733
 734         sock_recv_ts_and_drops(msg, sk, skb);
 735
 736         if (saddr) {
 737                 /* Clear the implicit padding in struct sockaddr_ieee802154
 738                  * (16 bits between 'family' and 'addr') and in struct
 739                  * ieee802154_addr_sa (16 bits at the end of the structure).
 740                  */
 741                 memset(saddr, 0, sizeof(*saddr));
 742
 743                 saddr->family = AF_IEEE802154;
 744                 ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
 745                 *addr_len = sizeof(*saddr);
 746         }
 747
 748         if (ro->want_lqi) {
 749                 err = put_cmsg(msg, SOL_IEEE802154, WPAN_WANTLQI,
 750                                sizeof(uint8_t), &(mac_cb(skb)->lqi));
 751                 if (err)
 752                         goto done;
 753         }
 754
 755         if (flags & MSG_TRUNC)
 756                 copied = skb->len;
 757 done:
 758         skb_free_datagram(sk, skb);
 759 out:
 760         if (err)
 761                 return err;
 762         return copied;
 763 }
 764
 765 static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
 766 {
 767         skb = skb_share_check(skb, GFP_ATOMIC);
 768         if (!skb)
 769                 return NET_RX_DROP;
 770
 771         if (sock_queue_rcv_skb(sk, skb) < 0) {
 772                 kfree_skb(skb);
 773                 return NET_RX_DROP;
 774         }
 775
 776         return NET_RX_SUCCESS;
 777 }
 778
 779 static inline bool
 780 ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
 781                       struct dgram_sock *ro)
 782 {
 783         if (!ro->bound)
 784                 return true;
 785
 786         if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
 787             hw_addr == ro->src_addr.extended_addr)
 788                 return true;
 789
 790         if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
 791             pan_id == ro->src_addr.pan_id &&
 792             short_addr == ro->src_addr.short_addr)
 793                 return true;
 794
 795         return false;
 796 }
 797
 798 static int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
 799 {
 800         struct sock *sk, *prev = NULL;
 801         int ret = NET_RX_SUCCESS;
 802         __le16 pan_id, short_addr;
 803         __le64 hw_addr;
 804
 805         /* Data frame processing */
 806         BUG_ON(dev->type != ARPHRD_IEEE802154);
 807
 808         pan_id = dev->ieee802154_ptr->pan_id;
 809         short_addr = dev->ieee802154_ptr->short_addr;
 810         hw_addr = dev->ieee802154_ptr->extended_addr;
 811
 812         read_lock(&dgram_lock);
 813         sk_for_each(sk, &dgram_head) {
 814                 if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
 815                                           dgram_sk(sk))) {
 816                         if (prev) {
 817                                 struct sk_buff *clone;
 818
 819                                 clone = skb_clone(skb, GFP_ATOMIC);
 820                                 if (clone)
 821                                         dgram_rcv_skb(prev, clone);
 822                         }
 823
 824                         prev = sk;
 825                 }
 826         }
 827
 828         if (prev) {
 829                 dgram_rcv_skb(prev, skb);
 830         } else {
 831                 kfree_skb(skb);
 832                 ret = NET_RX_DROP;
 833         }
 834         read_unlock(&dgram_lock);
 835
 836         return ret;
 837 }
 838
 839 static int dgram_getsockopt(struct sock *sk, int level, int optname,
 840                             char __user *optval, int __user *optlen)
 841 {
 842         struct dgram_sock *ro = dgram_sk(sk);
 843
 844         int val, len;
 845
 846         if (level != SOL_IEEE802154)
 847                 return -EOPNOTSUPP;
 848
 849         if (get_user(len, optlen))
 850                 return -EFAULT;
 851
 852         len = min_t(unsigned int, len, sizeof(int));
 853
 854         switch (optname) {
 855         case WPAN_WANTACK:
 856                 val = ro->want_ack;
 857                 break;
 858         case WPAN_WANTLQI:
 859                 val = ro->want_lqi;
 860                 break;
 861         case WPAN_SECURITY:
 862                 if (!ro->secen_override)
 863                         val = WPAN_SECURITY_DEFAULT;
 864                 else if (ro->secen)
 865                         val = WPAN_SECURITY_ON;
 866                 else
 867                         val = WPAN_SECURITY_OFF;
 868                 break;
 869         case WPAN_SECURITY_LEVEL:
 870                 if (!ro->seclevel_override)
 871                         val = WPAN_SECURITY_LEVEL_DEFAULT;
 872                 else
 873                         val = ro->seclevel;
 874                 break;
 875         default:
 876                 return -ENOPROTOOPT;
 877         }
 878
 879         if (put_user(len, optlen))
 880                 return -EFAULT;
 881         if (copy_to_user(optval, &val, len))
 882                 return -EFAULT;
 883         return 0;
 884 }
 885
 886 static int dgram_setsockopt(struct sock *sk, int level, int optname,
 887                             char __user *optval, unsigned int optlen)
 888 {
 889         struct dgram_sock *ro = dgram_sk(sk);
 890         struct net *net = sock_net(sk);
 891         int val;
 892         int err = 0;
 893
 894         if (optlen < sizeof(int))
 895                 return -EINVAL;
 896
 897         if (get_user(val, (int __user *)optval))
 898                 return -EFAULT;
 899
 900         lock_sock(sk);
 901
 902         switch (optname) {
 903         case WPAN_WANTACK:
 904                 ro->want_ack = !!val;
 905                 break;
 906         case WPAN_WANTLQI:
 907                 ro->want_lqi = !!val;
 908                 break;
 909         case WPAN_SECURITY:
 910                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 911                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 912                         err = -EPERM;
 913                         break;
 914                 }
 915
 916                 switch (val) {
 917                 case WPAN_SECURITY_DEFAULT:
 918                         ro->secen_override = 0;
 919                         break;
 920                 case WPAN_SECURITY_ON:
 921                         ro->secen_override = 1;
 922                         ro->secen = 1;
 923                         break;
 924                 case WPAN_SECURITY_OFF:
 925                         ro->secen_override = 1;
 926                         ro->secen = 0;
 927                         break;
 928                 default:
 929                         err = -EINVAL;
 930                         break;
 931                 }
 932                 break;
 933         case WPAN_SECURITY_LEVEL:
 934                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 935                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 936                         err = -EPERM;
 937                         break;
 938                 }
 939
 940                 if (val < WPAN_SECURITY_LEVEL_DEFAULT ||
 941                     val > IEEE802154_SCF_SECLEVEL_ENC_MIC128) {
 942                         err = -EINVAL;
 943                 } else if (val == WPAN_SECURITY_LEVEL_DEFAULT) {
 944                         ro->seclevel_override = 0;
 945                 } else {
 946                         ro->seclevel_override = 1;
 947                         ro->seclevel = val;
 948                 }
 949                 break;
 950         default:
 951                 err = -ENOPROTOOPT;
 952                 break;
 953         }
 954
 955         release_sock(sk);
 956         return err;
 957 }
 958
 959 static struct proto ieee802154_dgram_prot = {
 960         .name           = "IEEE-802.15.4-MAC",
 961         .owner          = THIS_MODULE,
 962         .obj_size       = sizeof(struct dgram_sock),
 963         .init           = dgram_init,
 964         .close          = dgram_close,
 965         .bind           = dgram_bind,
 966         .sendmsg        = dgram_sendmsg,
 967         .recvmsg        = dgram_recvmsg,
 968         .hash           = dgram_hash,
 969         .unhash         = dgram_unhash,
 970         .connect        = dgram_connect,
 971         .disconnect     = dgram_disconnect,
 972         .ioctl          = dgram_ioctl,
 973         .getsockopt     = dgram_getsockopt,
 974         .setsockopt     = dgram_setsockopt,
 975 };
 976
 977 static const struct proto_ops ieee802154_dgram_ops = {
 978         .family            = PF_IEEE802154,
 979         .owner             = THIS_MODULE,
 980         .release           = ieee802154_sock_release,
 981         .bind              = ieee802154_sock_bind,
 982         .connect           = ieee802154_sock_connect,
 983         .socketpair        = sock_no_socketpair,
 984         .accept            = sock_no_accept,
 985         .getname           = sock_no_getname,
 986         .poll              = datagram_poll,
 987         .ioctl             = ieee802154_sock_ioctl,
 988         .gettstamp         = sock_gettstamp,
 989         .listen            = sock_no_listen,
 990         .shutdown          = sock_no_shutdown,
 991         .setsockopt        = sock_common_setsockopt,
 992         .getsockopt        = sock_common_getsockopt,
 993         .sendmsg           = ieee802154_sock_sendmsg,
 994         .recvmsg           = sock_common_recvmsg,
 995         .mmap              = sock_no_mmap,
 996         .sendpage          = sock_no_sendpage,
 997 #ifdef CONFIG_COMPAT
 998         .compat_setsockopt = compat_sock_common_setsockopt,
 999         .compat_getsockopt = compat_sock_common_getsockopt,
1000 #endif
1001 };
1002
1003 /* Create a socket. Initialise the socket, blank the addresses
1004  * set the state.
1005  */
1006 static int ieee802154_create(struct net *net, struct socket *sock,
1007                              int protocol, int kern)
1008 {
1009         struct sock *sk;
1010         int rc;
1011         struct proto *proto;
1012         const struct proto_ops *ops;
1013
1014         if (!net_eq(net, &init_net))
1015                 return -EAFNOSUPPORT;
1016
1017         switch (sock->type) {
1018         case SOCK_RAW:
1019                 proto = &ieee802154_raw_prot;
1020                 ops = &ieee802154_raw_ops;
1021                 break;
1022         case SOCK_DGRAM:
1023                 proto = &ieee802154_dgram_prot;
1024                 ops = &ieee802154_dgram_ops;
1025                 break;
1026         default:
1027                 rc = -ESOCKTNOSUPPORT;
1028                 goto out;
1029         }
1030
1031         rc = -ENOMEM;
1032         sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto, kern);
1033         if (!sk)
1034                 goto out;
1035         rc = 0;
1036
1037         sock->ops = ops;
1038
1039         sock_init_data(sock, sk);
1040         /* FIXME: sk->sk_destruct */
1041         sk->sk_family = PF_IEEE802154;
1042
1043         /* Checksums on by default */
1044         sock_set_flag(sk, SOCK_ZAPPED);
1045
1046         if (sk->sk_prot->hash) {
1047                 rc = sk->sk_prot->hash(sk);
1048                 if (rc) {
1049                         sk_common_release(sk);
1050                         goto out;
1051                 }
1052         }
1053
1054         if (sk->sk_prot->init) {
1055                 rc = sk->sk_prot->init(sk);
1056                 if (rc)
1057                         sk_common_release(sk);
1058         }
1059 out:
1060         return rc;
1061 }
1062
1063 static const struct net_proto_family ieee802154_family_ops = {
1064         .family         = PF_IEEE802154,
1065         .create         = ieee802154_create,
1066         .owner          = THIS_MODULE,
1067 };
1068
1069 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
1070                           struct packet_type *pt, struct net_device *orig_dev)
1071 {
1072         if (!netif_running(dev))
1073                 goto drop;
1074         pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
1075 #ifdef DEBUG
1076         print_hex_dump_bytes("ieee802154_rcv ",
1077                              DUMP_PREFIX_NONE, skb->data, skb->len);
1078 #endif
1079
1080         if (!net_eq(dev_net(dev), &init_net))
1081                 goto drop;
1082
1083         ieee802154_raw_deliver(dev, skb);
1084
1085         if (dev->type != ARPHRD_IEEE802154)
1086                 goto drop;
1087
1088         if (skb->pkt_type != PACKET_OTHERHOST)
1089                 return ieee802154_dgram_deliver(dev, skb);
1090
1091 drop:
1092         kfree_skb(skb);
1093         return NET_RX_DROP;
1094 }
1095
1096 static struct packet_type ieee802154_packet_type = {
1097         .type = htons(ETH_P_IEEE802154),
1098         .func = ieee802154_rcv,
1099 };
1100
1101 static int __init af_ieee802154_init(void)
1102 {
1103         int rc = -EINVAL;
1104
1105         rc = proto_register(&ieee802154_raw_prot, 1);
1106         if (rc)
1107                 goto out;
1108
1109         rc = proto_register(&ieee802154_dgram_prot, 1);
1110         if (rc)
1111                 goto err_dgram;
1112
1113         /* Tell SOCKET that we are alive */
1114         rc = sock_register(&ieee802154_family_ops);
1115         if (rc)
1116                 goto err_sock;
1117         dev_add_pack(&ieee802154_packet_type);
1118
1119         rc = 0;
1120         goto out;
1121
1122 err_sock:
1123         proto_unregister(&ieee802154_dgram_prot);
1124 err_dgram:
1125         proto_unregister(&ieee802154_raw_prot);
1126 out:
1127         return rc;
1128 }
1129
1130 static void __exit af_ieee802154_remove(void)
1131 {
1132         dev_remove_pack(&ieee802154_packet_type);
1133         sock_unregister(PF_IEEE802154);
1134         proto_unregister(&ieee802154_dgram_prot);
1135         proto_unregister(&ieee802154_raw_prot);
1136 }
1137
1138 module_init(af_ieee802154_init);
1139 module_exit(af_ieee802154_remove);
1140
1141 MODULE_LICENSE("GPL");
1142 MODULE_ALIAS_NETPROTO(PF_IEEE802154);