net/ieee802154/socket.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * IEEE802154.4 socket interface
   4  *
   5  * Copyright 2007, 2008 Siemens AG
   6  *
   7  * Written by:
   8  * Sergey Lapin <slapin@ossfans.org>
   9  * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
  10  */
  11
  12 #include <linux/net.h>
  13 #include <linux/capability.h>
  14 #include <linux/module.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/if.h>
  17 #include <linux/termios.h>      /* For TIOCOUTQ/INQ */
  18 #include <linux/list.h>
  19 #include <linux/slab.h>
  20 #include <linux/socket.h>
  21 #include <net/datalink.h>
  22 #include <net/psnap.h>
  23 #include <net/sock.h>
  24 #include <net/tcp_states.h>
  25 #include <net/route.h>
  26
  27 #include <net/af_ieee802154.h>
  28 #include <net/ieee802154_netdev.h>
  29
  30 /* Utility function for families */
  31 static struct net_device*
  32 ieee802154_get_dev(struct net *net, const struct ieee802154_addr *addr)
  33 {
  34         struct net_device *dev = NULL;
  35         struct net_device *tmp;
  36         __le16 pan_id, short_addr;
  37         u8 hwaddr[IEEE802154_ADDR_LEN];
  38
  39         switch (addr->mode) {
  40         case IEEE802154_ADDR_LONG:
  41                 ieee802154_devaddr_to_raw(hwaddr, addr->extended_addr);
  42                 rcu_read_lock();
  43                 dev = dev_getbyhwaddr_rcu(net, ARPHRD_IEEE802154, hwaddr);
  44                 dev_hold(dev);
  45                 rcu_read_unlock();
  46                 break;
  47         case IEEE802154_ADDR_SHORT:
  48                 if (addr->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST) ||
  49                     addr->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
  50                     addr->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST))
  51                         break;
  52
  53                 rtnl_lock();
  54
  55                 for_each_netdev(net, tmp) {
  56                         if (tmp->type != ARPHRD_IEEE802154)
  57                                 continue;
  58
  59                         pan_id = tmp->ieee802154_ptr->pan_id;
  60                         short_addr = tmp->ieee802154_ptr->short_addr;
  61                         if (pan_id == addr->pan_id &&
  62                             short_addr == addr->short_addr) {
  63                                 dev = tmp;
  64                                 dev_hold(dev);
  65                                 break;
  66                         }
  67                 }
  68
  69                 rtnl_unlock();
  70                 break;
  71         default:
  72                 pr_warn("Unsupported ieee802154 address type: %d\n",
  73                         addr->mode);
  74                 break;
  75         }
  76
  77         return dev;
  78 }
  79
  80 static int ieee802154_sock_release(struct socket *sock)
  81 {
  82         struct sock *sk = sock->sk;
  83
  84         if (sk) {
  85                 sock->sk = NULL;
  86                 sk->sk_prot->close(sk, 0);
  87         }
  88         return 0;
  89 }
  90
  91 static int ieee802154_sock_sendmsg(struct socket *sock, struct msghdr *msg,
  92                                    size_t len)
  93 {
  94         struct sock *sk = sock->sk;
  95
  96         return sk->sk_prot->sendmsg(sk, msg, len);
  97 }
  98
  99 static int ieee802154_sock_bind(struct socket *sock, struct sockaddr *uaddr,
 100                                 int addr_len)
 101 {
 102         struct sock *sk = sock->sk;
 103
 104         if (sk->sk_prot->bind)
 105                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 106
 107         return sock_no_bind(sock, uaddr, addr_len);
 108 }
 109
 110 static int ieee802154_sock_connect(struct socket *sock, struct sockaddr *uaddr,
 111                                    int addr_len, int flags)
 112 {
 113         struct sock *sk = sock->sk;
 114
 115         if (addr_len < sizeof(uaddr->sa_family))
 116                 return -EINVAL;
 117
 118         if (uaddr->sa_family == AF_UNSPEC)
 119                 return sk->sk_prot->disconnect(sk, flags);
 120
 121         return sk->sk_prot->connect(sk, uaddr, addr_len);
 122 }
 123
 124 static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
 125                                 unsigned int cmd)
 126 {
 127         struct ifreq ifr;
 128         int ret = -ENOIOCTLCMD;
 129         struct net_device *dev;
 130
 131         if (get_user_ifreq(&ifr, NULL, arg))
 132                 return -EFAULT;
 133
 134         ifr.ifr_name[IFNAMSIZ-1] = 0;
 135
 136         dev_load(sock_net(sk), ifr.ifr_name);
 137         dev = dev_get_by_name(sock_net(sk), ifr.ifr_name);
 138
 139         if (!dev)
 140                 return -ENODEV;
 141
 142         if (dev->type == ARPHRD_IEEE802154 && dev->netdev_ops->ndo_do_ioctl)
 143                 ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);
 144
 145         if (!ret && put_user_ifreq(&ifr, arg))
 146                 ret = -EFAULT;
 147         dev_put(dev);
 148
 149         return ret;
 150 }
 151
 152 static int ieee802154_sock_ioctl(struct socket *sock, unsigned int cmd,
 153                                  unsigned long arg)
 154 {
 155         struct sock *sk = sock->sk;
 156
 157         switch (cmd) {
 158         case SIOCGIFADDR:
 159         case SIOCSIFADDR:
 160                 return ieee802154_dev_ioctl(sk, (struct ifreq __user *)arg,
 161                                 cmd);
 162         default:
 163                 if (!sk->sk_prot->ioctl)
 164                         return -ENOIOCTLCMD;
 165                 return sk->sk_prot->ioctl(sk, cmd, arg);
 166         }
 167 }
 168
 169 /* RAW Sockets (802.15.4 created in userspace) */
 170 static HLIST_HEAD(raw_head);
 171 static DEFINE_RWLOCK(raw_lock);
 172
 173 static int raw_hash(struct sock *sk)
 174 {
 175         write_lock_bh(&raw_lock);
 176         sk_add_node(sk, &raw_head);
 177         write_unlock_bh(&raw_lock);
 178         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 179
 180         return 0;
 181 }
 182
 183 static void raw_unhash(struct sock *sk)
 184 {
 185         write_lock_bh(&raw_lock);
 186         if (sk_del_node_init(sk))
 187                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 188         write_unlock_bh(&raw_lock);
 189 }
 190
 191 static void raw_close(struct sock *sk, long timeout)
 192 {
 193         sk_common_release(sk);
 194 }
 195
 196 static int raw_bind(struct sock *sk, struct sockaddr *_uaddr, int len)
 197 {
 198         struct ieee802154_addr addr;
 199         struct sockaddr_ieee802154 *uaddr = (struct sockaddr_ieee802154 *)_uaddr;
 200         int err = 0;
 201         struct net_device *dev = NULL;
 202
 203         if (len < sizeof(*uaddr))
 204                 return -EINVAL;
 205
 206         uaddr = (struct sockaddr_ieee802154 *)_uaddr;
 207         if (uaddr->family != AF_IEEE802154)
 208                 return -EINVAL;
 209
 210         lock_sock(sk);
 211
 212         ieee802154_addr_from_sa(&addr, &uaddr->addr);
 213         dev = ieee802154_get_dev(sock_net(sk), &addr);
 214         if (!dev) {
 215                 err = -ENODEV;
 216                 goto out;
 217         }
 218
 219         sk->sk_bound_dev_if = dev->ifindex;
 220         sk_dst_reset(sk);
 221
 222         dev_put(dev);
 223 out:
 224         release_sock(sk);
 225
 226         return err;
 227 }
 228
 229 static int raw_connect(struct sock *sk, struct sockaddr *uaddr,
 230                        int addr_len)
 231 {
 232         return -ENOTSUPP;
 233 }
 234
 235 static int raw_disconnect(struct sock *sk, int flags)
 236 {
 237         return 0;
 238 }
 239
 240 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 241 {
 242         struct net_device *dev;
 243         unsigned int mtu;
 244         struct sk_buff *skb;
 245         int hlen, tlen;
 246         int err;
 247
 248         if (msg->msg_flags & MSG_OOB) {
 249                 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
 250                 return -EOPNOTSUPP;
 251         }
 252
 253         lock_sock(sk);
 254         if (!sk->sk_bound_dev_if)
 255                 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
 256         else
 257                 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
 258         release_sock(sk);
 259
 260         if (!dev) {
 261                 pr_debug("no dev\n");
 262                 err = -ENXIO;
 263                 goto out;
 264         }
 265
 266         mtu = IEEE802154_MTU;
 267         pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
 268
 269         if (size > mtu) {
 270                 pr_debug("size = %zu, mtu = %u\n", size, mtu);
 271                 err = -EMSGSIZE;
 272                 goto out_dev;
 273         }
 274
 275         hlen = LL_RESERVED_SPACE(dev);
 276         tlen = dev->needed_tailroom;
 277         skb = sock_alloc_send_skb(sk, hlen + tlen + size,
 278                                   msg->msg_flags & MSG_DONTWAIT, &err);
 279         if (!skb)
 280                 goto out_dev;
 281
 282         skb_reserve(skb, hlen);
 283
 284         skb_reset_mac_header(skb);
 285         skb_reset_network_header(skb);
 286
 287         err = memcpy_from_msg(skb_put(skb, size), msg, size);
 288         if (err < 0)
 289                 goto out_skb;
 290
 291         skb->dev = dev;
 292         skb->protocol = htons(ETH_P_IEEE802154);
 293
 294         err = dev_queue_xmit(skb);
 295         if (err > 0)
 296                 err = net_xmit_errno(err);
 297
 298         dev_put(dev);
 299
 300         return err ?: size;
 301
 302 out_skb:
 303         kfree_skb(skb);
 304 out_dev:
 305         dev_put(dev);
 306 out:
 307         return err;
 308 }
 309
 310 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 311                        int noblock, int flags, int *addr_len)
 312 {
 313         size_t copied = 0;
 314         int err = -EOPNOTSUPP;
 315         struct sk_buff *skb;
 316
 317         skb = skb_recv_datagram(sk, flags, noblock, &err);
 318         if (!skb)
 319                 goto out;
 320
 321         copied = skb->len;
 322         if (len < copied) {
 323                 msg->msg_flags |= MSG_TRUNC;
 324                 copied = len;
 325         }
 326
 327         err = skb_copy_datagram_msg(skb, 0, msg, copied);
 328         if (err)
 329                 goto done;
 330
 331         sock_recv_ts_and_drops(msg, sk, skb);
 332
 333         if (flags & MSG_TRUNC)
 334                 copied = skb->len;
 335 done:
 336         skb_free_datagram(sk, skb);
 337 out:
 338         if (err)
 339                 return err;
 340         return copied;
 341 }
 342
 343 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
 344 {
 345         skb = skb_share_check(skb, GFP_ATOMIC);
 346         if (!skb)
 347                 return NET_RX_DROP;
 348
 349         if (sock_queue_rcv_skb(sk, skb) < 0) {
 350                 kfree_skb(skb);
 351                 return NET_RX_DROP;
 352         }
 353
 354         return NET_RX_SUCCESS;
 355 }
 356
 357 static void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
 358 {
 359         struct sock *sk;
 360
 361         read_lock(&raw_lock);
 362         sk_for_each(sk, &raw_head) {
 363                 bh_lock_sock(sk);
 364                 if (!sk->sk_bound_dev_if ||
 365                     sk->sk_bound_dev_if == dev->ifindex) {
 366                         struct sk_buff *clone;
 367
 368                         clone = skb_clone(skb, GFP_ATOMIC);
 369                         if (clone)
 370                                 raw_rcv_skb(sk, clone);
 371                 }
 372                 bh_unlock_sock(sk);
 373         }
 374         read_unlock(&raw_lock);
 375 }
 376
 377 static int raw_getsockopt(struct sock *sk, int level, int optname,
 378                           char __user *optval, int __user *optlen)
 379 {
 380         return -EOPNOTSUPP;
 381 }
 382
 383 static int raw_setsockopt(struct sock *sk, int level, int optname,
 384                           sockptr_t optval, unsigned int optlen)
 385 {
 386         return -EOPNOTSUPP;
 387 }
 388
 389 static struct proto ieee802154_raw_prot = {
 390         .name           = "IEEE-802.15.4-RAW",
 391         .owner          = THIS_MODULE,
 392         .obj_size       = sizeof(struct sock),
 393         .close          = raw_close,
 394         .bind           = raw_bind,
 395         .sendmsg        = raw_sendmsg,
 396         .recvmsg        = raw_recvmsg,
 397         .hash           = raw_hash,
 398         .unhash         = raw_unhash,
 399         .connect        = raw_connect,
 400         .disconnect     = raw_disconnect,
 401         .getsockopt     = raw_getsockopt,
 402         .setsockopt     = raw_setsockopt,
 403 };
 404
 405 static const struct proto_ops ieee802154_raw_ops = {
 406         .family            = PF_IEEE802154,
 407         .owner             = THIS_MODULE,
 408         .release           = ieee802154_sock_release,
 409         .bind              = ieee802154_sock_bind,
 410         .connect           = ieee802154_sock_connect,
 411         .socketpair        = sock_no_socketpair,
 412         .accept            = sock_no_accept,
 413         .getname           = sock_no_getname,
 414         .poll              = datagram_poll,
 415         .ioctl             = ieee802154_sock_ioctl,
 416         .gettstamp         = sock_gettstamp,
 417         .listen            = sock_no_listen,
 418         .shutdown          = sock_no_shutdown,
 419         .setsockopt        = sock_common_setsockopt,
 420         .getsockopt        = sock_common_getsockopt,
 421         .sendmsg           = ieee802154_sock_sendmsg,
 422         .recvmsg           = sock_common_recvmsg,
 423         .mmap              = sock_no_mmap,
 424         .sendpage          = sock_no_sendpage,
 425 };
 426
 427 /* DGRAM Sockets (802.15.4 dataframes) */
 428 static HLIST_HEAD(dgram_head);
 429 static DEFINE_RWLOCK(dgram_lock);
 430
 431 struct dgram_sock {
 432         struct sock sk;
 433
 434         struct ieee802154_addr src_addr;
 435         struct ieee802154_addr dst_addr;
 436
 437         unsigned int bound:1;
 438         unsigned int connected:1;
 439         unsigned int want_ack:1;
 440         unsigned int want_lqi:1;
 441         unsigned int secen:1;
 442         unsigned int secen_override:1;
 443         unsigned int seclevel:3;
 444         unsigned int seclevel_override:1;
 445 };
 446
 447 static inline struct dgram_sock *dgram_sk(const struct sock *sk)
 448 {
 449         return container_of(sk, struct dgram_sock, sk);
 450 }
 451
 452 static int dgram_hash(struct sock *sk)
 453 {
 454         write_lock_bh(&dgram_lock);
 455         sk_add_node(sk, &dgram_head);
 456         write_unlock_bh(&dgram_lock);
 457         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 458
 459         return 0;
 460 }
 461
 462 static void dgram_unhash(struct sock *sk)
 463 {
 464         write_lock_bh(&dgram_lock);
 465         if (sk_del_node_init(sk))
 466                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 467         write_unlock_bh(&dgram_lock);
 468 }
 469
 470 static int dgram_init(struct sock *sk)
 471 {
 472         struct dgram_sock *ro = dgram_sk(sk);
 473
 474         ro->want_ack = 1;
 475         ro->want_lqi = 0;
 476         return 0;
 477 }
 478
 479 static void dgram_close(struct sock *sk, long timeout)
 480 {
 481         sk_common_release(sk);
 482 }
 483
 484 static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
 485 {
 486         struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
 487         struct ieee802154_addr haddr;
 488         struct dgram_sock *ro = dgram_sk(sk);
 489         int err = -EINVAL;
 490         struct net_device *dev;
 491
 492         lock_sock(sk);
 493
 494         ro->bound = 0;
 495
 496         if (len < sizeof(*addr))
 497                 goto out;
 498
 499         if (addr->family != AF_IEEE802154)
 500                 goto out;
 501
 502         ieee802154_addr_from_sa(&haddr, &addr->addr);
 503         dev = ieee802154_get_dev(sock_net(sk), &haddr);
 504         if (!dev) {
 505                 err = -ENODEV;
 506                 goto out;
 507         }
 508
 509         if (dev->type != ARPHRD_IEEE802154) {
 510                 err = -ENODEV;
 511                 goto out_put;
 512         }
 513
 514         ro->src_addr = haddr;
 515
 516         ro->bound = 1;
 517         err = 0;
 518 out_put:
 519         dev_put(dev);
 520 out:
 521         release_sock(sk);
 522
 523         return err;
 524 }
 525
 526 static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
 527 {
 528         switch (cmd) {
 529         case SIOCOUTQ:
 530         {
 531                 int amount = sk_wmem_alloc_get(sk);
 532
 533                 return put_user(amount, (int __user *)arg);
 534         }
 535
 536         case SIOCINQ:
 537         {
 538                 struct sk_buff *skb;
 539                 unsigned long amount;
 540
 541                 amount = 0;
 542                 spin_lock_bh(&sk->sk_receive_queue.lock);
 543                 skb = skb_peek(&sk->sk_receive_queue);
 544                 if (skb) {
 545                         /* We will only return the amount
 546                          * of this packet since that is all
 547                          * that will be read.
 548                          */
 549                         amount = skb->len - ieee802154_hdr_length(skb);
 550                 }
 551                 spin_unlock_bh(&sk->sk_receive_queue.lock);
 552                 return put_user(amount, (int __user *)arg);
 553         }
 554         }
 555
 556         return -ENOIOCTLCMD;
 557 }
 558
 559 /* FIXME: autobind */
 560 static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
 561                          int len)
 562 {
 563         struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
 564         struct dgram_sock *ro = dgram_sk(sk);
 565         int err = 0;
 566
 567         if (len < sizeof(*addr))
 568                 return -EINVAL;
 569
 570         if (addr->family != AF_IEEE802154)
 571                 return -EINVAL;
 572
 573         lock_sock(sk);
 574
 575         if (!ro->bound) {
 576                 err = -ENETUNREACH;
 577                 goto out;
 578         }
 579
 580         ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);
 581         ro->connected = 1;
 582
 583 out:
 584         release_sock(sk);
 585         return err;
 586 }
 587
 588 static int dgram_disconnect(struct sock *sk, int flags)
 589 {
 590         struct dgram_sock *ro = dgram_sk(sk);
 591
 592         lock_sock(sk);
 593         ro->connected = 0;
 594         release_sock(sk);
 595
 596         return 0;
 597 }
 598
 599 static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 600 {
 601         struct net_device *dev;
 602         unsigned int mtu;
 603         struct sk_buff *skb;
 604         struct ieee802154_mac_cb *cb;
 605         struct dgram_sock *ro = dgram_sk(sk);
 606         struct ieee802154_addr dst_addr;
 607         int hlen, tlen;
 608         int err;
 609
 610         if (msg->msg_flags & MSG_OOB) {
 611                 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
 612                 return -EOPNOTSUPP;
 613         }
 614
 615         if (!ro->connected && !msg->msg_name)
 616                 return -EDESTADDRREQ;
 617         else if (ro->connected && msg->msg_name)
 618                 return -EISCONN;
 619
 620         if (!ro->bound)
 621                 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
 622         else
 623                 dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
 624
 625         if (!dev) {
 626                 pr_debug("no dev\n");
 627                 err = -ENXIO;
 628                 goto out;
 629         }
 630         mtu = IEEE802154_MTU;
 631         pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
 632
 633         if (size > mtu) {
 634                 pr_debug("size = %zu, mtu = %u\n", size, mtu);
 635                 err = -EMSGSIZE;
 636                 goto out_dev;
 637         }
 638
 639         hlen = LL_RESERVED_SPACE(dev);
 640         tlen = dev->needed_tailroom;
 641         skb = sock_alloc_send_skb(sk, hlen + tlen + size,
 642                                   msg->msg_flags & MSG_DONTWAIT,
 643                                   &err);
 644         if (!skb)
 645                 goto out_dev;
 646
 647         skb_reserve(skb, hlen);
 648
 649         skb_reset_network_header(skb);
 650
 651         cb = mac_cb_init(skb);
 652         cb->type = IEEE802154_FC_TYPE_DATA;
 653         cb->ackreq = ro->want_ack;
 654
 655         if (msg->msg_name) {
 656                 DECLARE_SOCKADDR(struct sockaddr_ieee802154*,
 657                                  daddr, msg->msg_name);
 658
 659                 ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
 660         } else {
 661                 dst_addr = ro->dst_addr;
 662         }
 663
 664         cb->secen = ro->secen;
 665         cb->secen_override = ro->secen_override;
 666         cb->seclevel = ro->seclevel;
 667         cb->seclevel_override = ro->seclevel_override;
 668
 669         err = wpan_dev_hard_header(skb, dev, &dst_addr,
 670                                    ro->bound ? &ro->src_addr : NULL, size);
 671         if (err < 0)
 672                 goto out_skb;
 673
 674         err = memcpy_from_msg(skb_put(skb, size), msg, size);
 675         if (err < 0)
 676                 goto out_skb;
 677
 678         skb->dev = dev;
 679         skb->protocol = htons(ETH_P_IEEE802154);
 680
 681         err = dev_queue_xmit(skb);
 682         if (err > 0)
 683                 err = net_xmit_errno(err);
 684
 685         dev_put(dev);
 686
 687         return err ?: size;
 688
 689 out_skb:
 690         kfree_skb(skb);
 691 out_dev:
 692         dev_put(dev);
 693 out:
 694         return err;
 695 }
 696
 697 static int dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 698                          int noblock, int flags, int *addr_len)
 699 {
 700         size_t copied = 0;
 701         int err = -EOPNOTSUPP;
 702         struct sk_buff *skb;
 703         struct dgram_sock *ro = dgram_sk(sk);
 704         DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
 705
 706         skb = skb_recv_datagram(sk, flags, noblock, &err);
 707         if (!skb)
 708                 goto out;
 709
 710         copied = skb->len;
 711         if (len < copied) {
 712                 msg->msg_flags |= MSG_TRUNC;
 713                 copied = len;
 714         }
 715
 716         /* FIXME: skip headers if necessary ?! */
 717         err = skb_copy_datagram_msg(skb, 0, msg, copied);
 718         if (err)
 719                 goto done;
 720
 721         sock_recv_ts_and_drops(msg, sk, skb);
 722
 723         if (saddr) {
 724                 /* Clear the implicit padding in struct sockaddr_ieee802154
 725                  * (16 bits between 'family' and 'addr') and in struct
 726                  * ieee802154_addr_sa (16 bits at the end of the structure).
 727                  */
 728                 memset(saddr, 0, sizeof(*saddr));
 729
 730                 saddr->family = AF_IEEE802154;
 731                 ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
 732                 *addr_len = sizeof(*saddr);
 733         }
 734
 735         if (ro->want_lqi) {
 736                 err = put_cmsg(msg, SOL_IEEE802154, WPAN_WANTLQI,
 737                                sizeof(uint8_t), &(mac_cb(skb)->lqi));
 738                 if (err)
 739                         goto done;
 740         }
 741
 742         if (flags & MSG_TRUNC)
 743                 copied = skb->len;
 744 done:
 745         skb_free_datagram(sk, skb);
 746 out:
 747         if (err)
 748                 return err;
 749         return copied;
 750 }
 751
 752 static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
 753 {
 754         skb = skb_share_check(skb, GFP_ATOMIC);
 755         if (!skb)
 756                 return NET_RX_DROP;
 757
 758         if (sock_queue_rcv_skb(sk, skb) < 0) {
 759                 kfree_skb(skb);
 760                 return NET_RX_DROP;
 761         }
 762
 763         return NET_RX_SUCCESS;
 764 }
 765
 766 static inline bool
 767 ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
 768                       struct dgram_sock *ro)
 769 {
 770         if (!ro->bound)
 771                 return true;
 772
 773         if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
 774             hw_addr == ro->src_addr.extended_addr)
 775                 return true;
 776
 777         if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
 778             pan_id == ro->src_addr.pan_id &&
 779             short_addr == ro->src_addr.short_addr)
 780                 return true;
 781
 782         return false;
 783 }
 784
 785 static int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
 786 {
 787         struct sock *sk, *prev = NULL;
 788         int ret = NET_RX_SUCCESS;
 789         __le16 pan_id, short_addr;
 790         __le64 hw_addr;
 791
 792         /* Data frame processing */
 793         BUG_ON(dev->type != ARPHRD_IEEE802154);
 794
 795         pan_id = dev->ieee802154_ptr->pan_id;
 796         short_addr = dev->ieee802154_ptr->short_addr;
 797         hw_addr = dev->ieee802154_ptr->extended_addr;
 798
 799         read_lock(&dgram_lock);
 800         sk_for_each(sk, &dgram_head) {
 801                 if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
 802                                           dgram_sk(sk))) {
 803                         if (prev) {
 804                                 struct sk_buff *clone;
 805
 806                                 clone = skb_clone(skb, GFP_ATOMIC);
 807                                 if (clone)
 808                                         dgram_rcv_skb(prev, clone);
 809                         }
 810
 811                         prev = sk;
 812                 }
 813         }
 814
 815         if (prev) {
 816                 dgram_rcv_skb(prev, skb);
 817         } else {
 818                 kfree_skb(skb);
 819                 ret = NET_RX_DROP;
 820         }
 821         read_unlock(&dgram_lock);
 822
 823         return ret;
 824 }
 825
 826 static int dgram_getsockopt(struct sock *sk, int level, int optname,
 827                             char __user *optval, int __user *optlen)
 828 {
 829         struct dgram_sock *ro = dgram_sk(sk);
 830
 831         int val, len;
 832
 833         if (level != SOL_IEEE802154)
 834                 return -EOPNOTSUPP;
 835
 836         if (get_user(len, optlen))
 837                 return -EFAULT;
 838
 839         len = min_t(unsigned int, len, sizeof(int));
 840
 841         switch (optname) {
 842         case WPAN_WANTACK:
 843                 val = ro->want_ack;
 844                 break;
 845         case WPAN_WANTLQI:
 846                 val = ro->want_lqi;
 847                 break;
 848         case WPAN_SECURITY:
 849                 if (!ro->secen_override)
 850                         val = WPAN_SECURITY_DEFAULT;
 851                 else if (ro->secen)
 852                         val = WPAN_SECURITY_ON;
 853                 else
 854                         val = WPAN_SECURITY_OFF;
 855                 break;
 856         case WPAN_SECURITY_LEVEL:
 857                 if (!ro->seclevel_override)
 858                         val = WPAN_SECURITY_LEVEL_DEFAULT;
 859                 else
 860                         val = ro->seclevel;
 861                 break;
 862         default:
 863                 return -ENOPROTOOPT;
 864         }
 865
 866         if (put_user(len, optlen))
 867                 return -EFAULT;
 868         if (copy_to_user(optval, &val, len))
 869                 return -EFAULT;
 870         return 0;
 871 }
 872
 873 static int dgram_setsockopt(struct sock *sk, int level, int optname,
 874                             sockptr_t optval, unsigned int optlen)
 875 {
 876         struct dgram_sock *ro = dgram_sk(sk);
 877         struct net *net = sock_net(sk);
 878         int val;
 879         int err = 0;
 880
 881         if (optlen < sizeof(int))
 882                 return -EINVAL;
 883
 884         if (copy_from_sockptr(&val, optval, sizeof(int)))
 885                 return -EFAULT;
 886
 887         lock_sock(sk);
 888
 889         switch (optname) {
 890         case WPAN_WANTACK:
 891                 ro->want_ack = !!val;
 892                 break;
 893         case WPAN_WANTLQI:
 894                 ro->want_lqi = !!val;
 895                 break;
 896         case WPAN_SECURITY:
 897                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 898                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 899                         err = -EPERM;
 900                         break;
 901                 }
 902
 903                 switch (val) {
 904                 case WPAN_SECURITY_DEFAULT:
 905                         ro->secen_override = 0;
 906                         break;
 907                 case WPAN_SECURITY_ON:
 908                         ro->secen_override = 1;
 909                         ro->secen = 1;
 910                         break;
 911                 case WPAN_SECURITY_OFF:
 912                         ro->secen_override = 1;
 913                         ro->secen = 0;
 914                         break;
 915                 default:
 916                         err = -EINVAL;
 917                         break;
 918                 }
 919                 break;
 920         case WPAN_SECURITY_LEVEL:
 921                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 922                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 923                         err = -EPERM;
 924                         break;
 925                 }
 926
 927                 if (val < WPAN_SECURITY_LEVEL_DEFAULT ||
 928                     val > IEEE802154_SCF_SECLEVEL_ENC_MIC128) {
 929                         err = -EINVAL;
 930                 } else if (val == WPAN_SECURITY_LEVEL_DEFAULT) {
 931                         ro->seclevel_override = 0;
 932                 } else {
 933                         ro->seclevel_override = 1;
 934                         ro->seclevel = val;
 935                 }
 936                 break;
 937         default:
 938                 err = -ENOPROTOOPT;
 939                 break;
 940         }
 941
 942         release_sock(sk);
 943         return err;
 944 }
 945
 946 static struct proto ieee802154_dgram_prot = {
 947         .name           = "IEEE-802.15.4-MAC",
 948         .owner          = THIS_MODULE,
 949         .obj_size       = sizeof(struct dgram_sock),
 950         .init           = dgram_init,
 951         .close          = dgram_close,
 952         .bind           = dgram_bind,
 953         .sendmsg        = dgram_sendmsg,
 954         .recvmsg        = dgram_recvmsg,
 955         .hash           = dgram_hash,
 956         .unhash         = dgram_unhash,
 957         .connect        = dgram_connect,
 958         .disconnect     = dgram_disconnect,
 959         .ioctl          = dgram_ioctl,
 960         .getsockopt     = dgram_getsockopt,
 961         .setsockopt     = dgram_setsockopt,
 962 };
 963
 964 static const struct proto_ops ieee802154_dgram_ops = {
 965         .family            = PF_IEEE802154,
 966         .owner             = THIS_MODULE,
 967         .release           = ieee802154_sock_release,
 968         .bind              = ieee802154_sock_bind,
 969         .connect           = ieee802154_sock_connect,
 970         .socketpair        = sock_no_socketpair,
 971         .accept            = sock_no_accept,
 972         .getname           = sock_no_getname,
 973         .poll              = datagram_poll,
 974         .ioctl             = ieee802154_sock_ioctl,
 975         .gettstamp         = sock_gettstamp,
 976         .listen            = sock_no_listen,
 977         .shutdown          = sock_no_shutdown,
 978         .setsockopt        = sock_common_setsockopt,
 979         .getsockopt        = sock_common_getsockopt,
 980         .sendmsg           = ieee802154_sock_sendmsg,
 981         .recvmsg           = sock_common_recvmsg,
 982         .mmap              = sock_no_mmap,
 983         .sendpage          = sock_no_sendpage,
 984 };
 985
 986 static void ieee802154_sock_destruct(struct sock *sk)
 987 {
 988         skb_queue_purge(&sk->sk_receive_queue);
 989 }
 990
 991 /* Create a socket. Initialise the socket, blank the addresses
 992  * set the state.
 993  */
 994 static int ieee802154_create(struct net *net, struct socket *sock,
 995                              int protocol, int kern)
 996 {
 997         struct sock *sk;
 998         int rc;
 999         struct proto *proto;
1000         const struct proto_ops *ops;
1001
1002         if (!net_eq(net, &init_net))
1003                 return -EAFNOSUPPORT;
1004
1005         switch (sock->type) {
1006         case SOCK_RAW:
1007                 rc = -EPERM;
1008                 if (!capable(CAP_NET_RAW))
1009                         goto out;
1010                 proto = &ieee802154_raw_prot;
1011                 ops = &ieee802154_raw_ops;
1012                 break;
1013         case SOCK_DGRAM:
1014                 proto = &ieee802154_dgram_prot;
1015                 ops = &ieee802154_dgram_ops;
1016                 break;
1017         default:
1018                 rc = -ESOCKTNOSUPPORT;
1019                 goto out;
1020         }
1021
1022         rc = -ENOMEM;
1023         sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto, kern);
1024         if (!sk)
1025                 goto out;
1026         rc = 0;
1027
1028         sock->ops = ops;
1029
1030         sock_init_data(sock, sk);
1031         sk->sk_destruct = ieee802154_sock_destruct;
1032         sk->sk_family = PF_IEEE802154;
1033
1034         /* Checksums on by default */
1035         sock_set_flag(sk, SOCK_ZAPPED);
1036
1037         if (sk->sk_prot->hash) {
1038                 rc = sk->sk_prot->hash(sk);
1039                 if (rc) {
1040                         sk_common_release(sk);
1041                         goto out;
1042                 }
1043         }
1044
1045         if (sk->sk_prot->init) {
1046                 rc = sk->sk_prot->init(sk);
1047                 if (rc)
1048                         sk_common_release(sk);
1049         }
1050 out:
1051         return rc;
1052 }
1053
1054 static const struct net_proto_family ieee802154_family_ops = {
1055         .family         = PF_IEEE802154,
1056         .create         = ieee802154_create,
1057         .owner          = THIS_MODULE,
1058 };
1059
1060 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
1061                           struct packet_type *pt, struct net_device *orig_dev)
1062 {
1063         if (!netif_running(dev))
1064                 goto drop;
1065         pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
1066 #ifdef DEBUG
1067         print_hex_dump_bytes("ieee802154_rcv ",
1068                              DUMP_PREFIX_NONE, skb->data, skb->len);
1069 #endif
1070
1071         if (!net_eq(dev_net(dev), &init_net))
1072                 goto drop;
1073
1074         ieee802154_raw_deliver(dev, skb);
1075
1076         if (dev->type != ARPHRD_IEEE802154)
1077                 goto drop;
1078
1079         if (skb->pkt_type != PACKET_OTHERHOST)
1080                 return ieee802154_dgram_deliver(dev, skb);
1081
1082 drop:
1083         kfree_skb(skb);
1084         return NET_RX_DROP;
1085 }
1086
1087 static struct packet_type ieee802154_packet_type = {
1088         .type = htons(ETH_P_IEEE802154),
1089         .func = ieee802154_rcv,
1090 };
1091
1092 static int __init af_ieee802154_init(void)
1093 {
1094         int rc;
1095
1096         rc = proto_register(&ieee802154_raw_prot, 1);
1097         if (rc)
1098                 goto out;
1099
1100         rc = proto_register(&ieee802154_dgram_prot, 1);
1101         if (rc)
1102                 goto err_dgram;
1103
1104         /* Tell SOCKET that we are alive */
1105         rc = sock_register(&ieee802154_family_ops);
1106         if (rc)
1107                 goto err_sock;
1108         dev_add_pack(&ieee802154_packet_type);
1109
1110         rc = 0;
1111         goto out;
1112
1113 err_sock:
1114         proto_unregister(&ieee802154_dgram_prot);
1115 err_dgram:
1116         proto_unregister(&ieee802154_raw_prot);
1117 out:
1118         return rc;
1119 }
1120
1121 static void __exit af_ieee802154_remove(void)
1122 {
1123         dev_remove_pack(&ieee802154_packet_type);
1124         sock_unregister(PF_IEEE802154);
1125         proto_unregister(&ieee802154_dgram_prot);
1126         proto_unregister(&ieee802154_raw_prot);
1127 }
1128
1129 module_init(af_ieee802154_init);
1130 module_exit(af_ieee802154_remove);
1131
1132 MODULE_LICENSE("GPL");
1133 MODULE_ALIAS_NETPROTO(PF_IEEE802154);