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         err = ieee802154_sockaddr_check_size(uaddr, len);
 204         if (err < 0)
 205                 return err;
 206
 207         uaddr = (struct sockaddr_ieee802154 *)_uaddr;
 208         if (uaddr->family != AF_IEEE802154)
 209                 return -EINVAL;
 210
 211         lock_sock(sk);
 212
 213         ieee802154_addr_from_sa(&addr, &uaddr->addr);
 214         dev = ieee802154_get_dev(sock_net(sk), &addr);
 215         if (!dev) {
 216                 err = -ENODEV;
 217                 goto out;
 218         }
 219
 220         sk->sk_bound_dev_if = dev->ifindex;
 221         sk_dst_reset(sk);
 222
 223         dev_put(dev);
 224 out:
 225         release_sock(sk);
 226
 227         return err;
 228 }
 229
 230 static int raw_connect(struct sock *sk, struct sockaddr *uaddr,
 231                        int addr_len)
 232 {
 233         return -ENOTSUPP;
 234 }
 235
 236 static int raw_disconnect(struct sock *sk, int flags)
 237 {
 238         return 0;
 239 }
 240
 241 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 242 {
 243         struct net_device *dev;
 244         unsigned int mtu;
 245         struct sk_buff *skb;
 246         int hlen, tlen;
 247         int err;
 248
 249         if (msg->msg_flags & MSG_OOB) {
 250                 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
 251                 return -EOPNOTSUPP;
 252         }
 253
 254         lock_sock(sk);
 255         if (!sk->sk_bound_dev_if)
 256                 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
 257         else
 258                 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
 259         release_sock(sk);
 260
 261         if (!dev) {
 262                 pr_debug("no dev\n");
 263                 err = -ENXIO;
 264                 goto out;
 265         }
 266
 267         mtu = IEEE802154_MTU;
 268         pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
 269
 270         if (size > mtu) {
 271                 pr_debug("size = %zu, mtu = %u\n", size, mtu);
 272                 err = -EMSGSIZE;
 273                 goto out_dev;
 274         }
 275         if (!size) {
 276                 err = 0;
 277                 goto out_dev;
 278         }
 279
 280         hlen = LL_RESERVED_SPACE(dev);
 281         tlen = dev->needed_tailroom;
 282         skb = sock_alloc_send_skb(sk, hlen + tlen + size,
 283                                   msg->msg_flags & MSG_DONTWAIT, &err);
 284         if (!skb)
 285                 goto out_dev;
 286
 287         skb_reserve(skb, hlen);
 288
 289         skb_reset_mac_header(skb);
 290         skb_reset_network_header(skb);
 291
 292         err = memcpy_from_msg(skb_put(skb, size), msg, size);
 293         if (err < 0)
 294                 goto out_skb;
 295
 296         skb->dev = dev;
 297         skb->protocol = htons(ETH_P_IEEE802154);
 298
 299         err = dev_queue_xmit(skb);
 300         if (err > 0)
 301                 err = net_xmit_errno(err);
 302
 303         dev_put(dev);
 304
 305         return err ?: size;
 306
 307 out_skb:
 308         kfree_skb(skb);
 309 out_dev:
 310         dev_put(dev);
 311 out:
 312         return err;
 313 }
 314
 315 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 316                        int flags, int *addr_len)
 317 {
 318         size_t copied = 0;
 319         int err = -EOPNOTSUPP;
 320         struct sk_buff *skb;
 321
 322         skb = skb_recv_datagram(sk, flags, &err);
 323         if (!skb)
 324                 goto out;
 325
 326         copied = skb->len;
 327         if (len < copied) {
 328                 msg->msg_flags |= MSG_TRUNC;
 329                 copied = len;
 330         }
 331
 332         err = skb_copy_datagram_msg(skb, 0, msg, copied);
 333         if (err)
 334                 goto done;
 335
 336         sock_recv_cmsgs(msg, sk, skb);
 337
 338         if (flags & MSG_TRUNC)
 339                 copied = skb->len;
 340 done:
 341         skb_free_datagram(sk, skb);
 342 out:
 343         if (err)
 344                 return err;
 345         return copied;
 346 }
 347
 348 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
 349 {
 350         skb = skb_share_check(skb, GFP_ATOMIC);
 351         if (!skb)
 352                 return NET_RX_DROP;
 353
 354         if (sock_queue_rcv_skb(sk, skb) < 0) {
 355                 kfree_skb(skb);
 356                 return NET_RX_DROP;
 357         }
 358
 359         return NET_RX_SUCCESS;
 360 }
 361
 362 static void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
 363 {
 364         struct sock *sk;
 365
 366         read_lock(&raw_lock);
 367         sk_for_each(sk, &raw_head) {
 368                 bh_lock_sock(sk);
 369                 if (!sk->sk_bound_dev_if ||
 370                     sk->sk_bound_dev_if == dev->ifindex) {
 371                         struct sk_buff *clone;
 372
 373                         clone = skb_clone(skb, GFP_ATOMIC);
 374                         if (clone)
 375                                 raw_rcv_skb(sk, clone);
 376                 }
 377                 bh_unlock_sock(sk);
 378         }
 379         read_unlock(&raw_lock);
 380 }
 381
 382 static int raw_getsockopt(struct sock *sk, int level, int optname,
 383                           char __user *optval, int __user *optlen)
 384 {
 385         return -EOPNOTSUPP;
 386 }
 387
 388 static int raw_setsockopt(struct sock *sk, int level, int optname,
 389                           sockptr_t optval, unsigned int optlen)
 390 {
 391         return -EOPNOTSUPP;
 392 }
 393
 394 static struct proto ieee802154_raw_prot = {
 395         .name           = "IEEE-802.15.4-RAW",
 396         .owner          = THIS_MODULE,
 397         .obj_size       = sizeof(struct sock),
 398         .close          = raw_close,
 399         .bind           = raw_bind,
 400         .sendmsg        = raw_sendmsg,
 401         .recvmsg        = raw_recvmsg,
 402         .hash           = raw_hash,
 403         .unhash         = raw_unhash,
 404         .connect        = raw_connect,
 405         .disconnect     = raw_disconnect,
 406         .getsockopt     = raw_getsockopt,
 407         .setsockopt     = raw_setsockopt,
 408 };
 409
 410 static const struct proto_ops ieee802154_raw_ops = {
 411         .family            = PF_IEEE802154,
 412         .owner             = THIS_MODULE,
 413         .release           = ieee802154_sock_release,
 414         .bind              = ieee802154_sock_bind,
 415         .connect           = ieee802154_sock_connect,
 416         .socketpair        = sock_no_socketpair,
 417         .accept            = sock_no_accept,
 418         .getname           = sock_no_getname,
 419         .poll              = datagram_poll,
 420         .ioctl             = ieee802154_sock_ioctl,
 421         .gettstamp         = sock_gettstamp,
 422         .listen            = sock_no_listen,
 423         .shutdown          = sock_no_shutdown,
 424         .setsockopt        = sock_common_setsockopt,
 425         .getsockopt        = sock_common_getsockopt,
 426         .sendmsg           = ieee802154_sock_sendmsg,
 427         .recvmsg           = sock_common_recvmsg,
 428         .mmap              = sock_no_mmap,
 429         .sendpage          = sock_no_sendpage,
 430 };
 431
 432 /* DGRAM Sockets (802.15.4 dataframes) */
 433 static HLIST_HEAD(dgram_head);
 434 static DEFINE_RWLOCK(dgram_lock);
 435
 436 struct dgram_sock {
 437         struct sock sk;
 438
 439         struct ieee802154_addr src_addr;
 440         struct ieee802154_addr dst_addr;
 441
 442         unsigned int bound:1;
 443         unsigned int connected:1;
 444         unsigned int want_ack:1;
 445         unsigned int want_lqi:1;
 446         unsigned int secen:1;
 447         unsigned int secen_override:1;
 448         unsigned int seclevel:3;
 449         unsigned int seclevel_override:1;
 450 };
 451
 452 static inline struct dgram_sock *dgram_sk(const struct sock *sk)
 453 {
 454         return container_of(sk, struct dgram_sock, sk);
 455 }
 456
 457 static int dgram_hash(struct sock *sk)
 458 {
 459         write_lock_bh(&dgram_lock);
 460         sk_add_node(sk, &dgram_head);
 461         write_unlock_bh(&dgram_lock);
 462         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 463
 464         return 0;
 465 }
 466
 467 static void dgram_unhash(struct sock *sk)
 468 {
 469         write_lock_bh(&dgram_lock);
 470         if (sk_del_node_init(sk))
 471                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 472         write_unlock_bh(&dgram_lock);
 473 }
 474
 475 static int dgram_init(struct sock *sk)
 476 {
 477         struct dgram_sock *ro = dgram_sk(sk);
 478
 479         ro->want_ack = 1;
 480         ro->want_lqi = 0;
 481         return 0;
 482 }
 483
 484 static void dgram_close(struct sock *sk, long timeout)
 485 {
 486         sk_common_release(sk);
 487 }
 488
 489 static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
 490 {
 491         struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
 492         struct ieee802154_addr haddr;
 493         struct dgram_sock *ro = dgram_sk(sk);
 494         int err = -EINVAL;
 495         struct net_device *dev;
 496
 497         lock_sock(sk);
 498
 499         ro->bound = 0;
 500
 501         err = ieee802154_sockaddr_check_size(addr, len);
 502         if (err < 0)
 503                 goto out;
 504
 505         if (addr->family != AF_IEEE802154)
 506                 goto out;
 507
 508         ieee802154_addr_from_sa(&haddr, &addr->addr);
 509         dev = ieee802154_get_dev(sock_net(sk), &haddr);
 510         if (!dev) {
 511                 err = -ENODEV;
 512                 goto out;
 513         }
 514
 515         if (dev->type != ARPHRD_IEEE802154) {
 516                 err = -ENODEV;
 517                 goto out_put;
 518         }
 519
 520         ro->src_addr = haddr;
 521
 522         ro->bound = 1;
 523         err = 0;
 524 out_put:
 525         dev_put(dev);
 526 out:
 527         release_sock(sk);
 528
 529         return err;
 530 }
 531
 532 static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
 533 {
 534         switch (cmd) {
 535         case SIOCOUTQ:
 536         {
 537                 int amount = sk_wmem_alloc_get(sk);
 538
 539                 return put_user(amount, (int __user *)arg);
 540         }
 541
 542         case SIOCINQ:
 543         {
 544                 struct sk_buff *skb;
 545                 unsigned long amount;
 546
 547                 amount = 0;
 548                 spin_lock_bh(&sk->sk_receive_queue.lock);
 549                 skb = skb_peek(&sk->sk_receive_queue);
 550                 if (skb) {
 551                         /* We will only return the amount
 552                          * of this packet since that is all
 553                          * that will be read.
 554                          */
 555                         amount = skb->len - ieee802154_hdr_length(skb);
 556                 }
 557                 spin_unlock_bh(&sk->sk_receive_queue.lock);
 558                 return put_user(amount, (int __user *)arg);
 559         }
 560         }
 561
 562         return -ENOIOCTLCMD;
 563 }
 564
 565 /* FIXME: autobind */
 566 static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
 567                          int len)
 568 {
 569         struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
 570         struct dgram_sock *ro = dgram_sk(sk);
 571         int err = 0;
 572
 573         err = ieee802154_sockaddr_check_size(addr, len);
 574         if (err < 0)
 575                 return err;
 576
 577         if (addr->family != AF_IEEE802154)
 578                 return -EINVAL;
 579
 580         lock_sock(sk);
 581
 582         if (!ro->bound) {
 583                 err = -ENETUNREACH;
 584                 goto out;
 585         }
 586
 587         ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);
 588         ro->connected = 1;
 589
 590 out:
 591         release_sock(sk);
 592         return err;
 593 }
 594
 595 static int dgram_disconnect(struct sock *sk, int flags)
 596 {
 597         struct dgram_sock *ro = dgram_sk(sk);
 598
 599         lock_sock(sk);
 600         ro->connected = 0;
 601         release_sock(sk);
 602
 603         return 0;
 604 }
 605
 606 static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 607 {
 608         struct net_device *dev;
 609         unsigned int mtu;
 610         struct sk_buff *skb;
 611         struct ieee802154_mac_cb *cb;
 612         struct dgram_sock *ro = dgram_sk(sk);
 613         struct ieee802154_addr dst_addr;
 614         DECLARE_SOCKADDR(struct sockaddr_ieee802154*, daddr, msg->msg_name);
 615         int hlen, tlen;
 616         int err;
 617
 618         if (msg->msg_flags & MSG_OOB) {
 619                 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
 620                 return -EOPNOTSUPP;
 621         }
 622
 623         if (msg->msg_name) {
 624                 if (ro->connected)
 625                         return -EISCONN;
 626                 if (msg->msg_namelen < IEEE802154_MIN_NAMELEN)
 627                         return -EINVAL;
 628                 err = ieee802154_sockaddr_check_size(daddr, msg->msg_namelen);
 629                 if (err < 0)
 630                         return err;
 631                 ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
 632         } else {
 633                 if (!ro->connected)
 634                         return -EDESTADDRREQ;
 635                 dst_addr = ro->dst_addr;
 636         }
 637
 638         if (!ro->bound)
 639                 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
 640         else
 641                 dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
 642
 643         if (!dev) {
 644                 pr_debug("no dev\n");
 645                 err = -ENXIO;
 646                 goto out;
 647         }
 648         mtu = IEEE802154_MTU;
 649         pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
 650
 651         if (size > mtu) {
 652                 pr_debug("size = %zu, mtu = %u\n", size, mtu);
 653                 err = -EMSGSIZE;
 654                 goto out_dev;
 655         }
 656
 657         hlen = LL_RESERVED_SPACE(dev);
 658         tlen = dev->needed_tailroom;
 659         skb = sock_alloc_send_skb(sk, hlen + tlen + size,
 660                                   msg->msg_flags & MSG_DONTWAIT,
 661                                   &err);
 662         if (!skb)
 663                 goto out_dev;
 664
 665         skb_reserve(skb, hlen);
 666
 667         skb_reset_network_header(skb);
 668
 669         cb = mac_cb_init(skb);
 670         cb->type = IEEE802154_FC_TYPE_DATA;
 671         cb->ackreq = ro->want_ack;
 672         cb->secen = ro->secen;
 673         cb->secen_override = ro->secen_override;
 674         cb->seclevel = ro->seclevel;
 675         cb->seclevel_override = ro->seclevel_override;
 676
 677         err = wpan_dev_hard_header(skb, dev, &dst_addr,
 678                                    ro->bound ? &ro->src_addr : NULL, size);
 679         if (err < 0)
 680                 goto out_skb;
 681
 682         err = memcpy_from_msg(skb_put(skb, size), msg, size);
 683         if (err < 0)
 684                 goto out_skb;
 685
 686         skb->dev = dev;
 687         skb->protocol = htons(ETH_P_IEEE802154);
 688
 689         err = dev_queue_xmit(skb);
 690         if (err > 0)
 691                 err = net_xmit_errno(err);
 692
 693         dev_put(dev);
 694
 695         return err ?: size;
 696
 697 out_skb:
 698         kfree_skb(skb);
 699 out_dev:
 700         dev_put(dev);
 701 out:
 702         return err;
 703 }
 704
 705 static int dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 706                          int flags, int *addr_len)
 707 {
 708         size_t copied = 0;
 709         int err = -EOPNOTSUPP;
 710         struct sk_buff *skb;
 711         struct dgram_sock *ro = dgram_sk(sk);
 712         DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
 713
 714         skb = skb_recv_datagram(sk, flags, &err);
 715         if (!skb)
 716                 goto out;
 717
 718         copied = skb->len;
 719         if (len < copied) {
 720                 msg->msg_flags |= MSG_TRUNC;
 721                 copied = len;
 722         }
 723
 724         /* FIXME: skip headers if necessary ?! */
 725         err = skb_copy_datagram_msg(skb, 0, msg, copied);
 726         if (err)
 727                 goto done;
 728
 729         sock_recv_cmsgs(msg, sk, skb);
 730
 731         if (saddr) {
 732                 /* Clear the implicit padding in struct sockaddr_ieee802154
 733                  * (16 bits between 'family' and 'addr') and in struct
 734                  * ieee802154_addr_sa (16 bits at the end of the structure).
 735                  */
 736                 memset(saddr, 0, sizeof(*saddr));
 737
 738                 saddr->family = AF_IEEE802154;
 739                 ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
 740                 *addr_len = sizeof(*saddr);
 741         }
 742
 743         if (ro->want_lqi) {
 744                 err = put_cmsg(msg, SOL_IEEE802154, WPAN_WANTLQI,
 745                                sizeof(uint8_t), &(mac_cb(skb)->lqi));
 746                 if (err)
 747                         goto done;
 748         }
 749
 750         if (flags & MSG_TRUNC)
 751                 copied = skb->len;
 752 done:
 753         skb_free_datagram(sk, skb);
 754 out:
 755         if (err)
 756                 return err;
 757         return copied;
 758 }
 759
 760 static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
 761 {
 762         skb = skb_share_check(skb, GFP_ATOMIC);
 763         if (!skb)
 764                 return NET_RX_DROP;
 765
 766         if (sock_queue_rcv_skb(sk, skb) < 0) {
 767                 kfree_skb(skb);
 768                 return NET_RX_DROP;
 769         }
 770
 771         return NET_RX_SUCCESS;
 772 }
 773
 774 static inline bool
 775 ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
 776                       struct dgram_sock *ro)
 777 {
 778         if (!ro->bound)
 779                 return true;
 780
 781         if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
 782             hw_addr == ro->src_addr.extended_addr)
 783                 return true;
 784
 785         if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
 786             pan_id == ro->src_addr.pan_id &&
 787             short_addr == ro->src_addr.short_addr)
 788                 return true;
 789
 790         return false;
 791 }
 792
 793 static int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
 794 {
 795         struct sock *sk, *prev = NULL;
 796         int ret = NET_RX_SUCCESS;
 797         __le16 pan_id, short_addr;
 798         __le64 hw_addr;
 799
 800         /* Data frame processing */
 801         BUG_ON(dev->type != ARPHRD_IEEE802154);
 802
 803         pan_id = dev->ieee802154_ptr->pan_id;
 804         short_addr = dev->ieee802154_ptr->short_addr;
 805         hw_addr = dev->ieee802154_ptr->extended_addr;
 806
 807         read_lock(&dgram_lock);
 808         sk_for_each(sk, &dgram_head) {
 809                 if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
 810                                           dgram_sk(sk))) {
 811                         if (prev) {
 812                                 struct sk_buff *clone;
 813
 814                                 clone = skb_clone(skb, GFP_ATOMIC);
 815                                 if (clone)
 816                                         dgram_rcv_skb(prev, clone);
 817                         }
 818
 819                         prev = sk;
 820                 }
 821         }
 822
 823         if (prev) {
 824                 dgram_rcv_skb(prev, skb);
 825         } else {
 826                 kfree_skb(skb);
 827                 ret = NET_RX_DROP;
 828         }
 829         read_unlock(&dgram_lock);
 830
 831         return ret;
 832 }
 833
 834 static int dgram_getsockopt(struct sock *sk, int level, int optname,
 835                             char __user *optval, int __user *optlen)
 836 {
 837         struct dgram_sock *ro = dgram_sk(sk);
 838
 839         int val, len;
 840
 841         if (level != SOL_IEEE802154)
 842                 return -EOPNOTSUPP;
 843
 844         if (get_user(len, optlen))
 845                 return -EFAULT;
 846
 847         len = min_t(unsigned int, len, sizeof(int));
 848
 849         switch (optname) {
 850         case WPAN_WANTACK:
 851                 val = ro->want_ack;
 852                 break;
 853         case WPAN_WANTLQI:
 854                 val = ro->want_lqi;
 855                 break;
 856         case WPAN_SECURITY:
 857                 if (!ro->secen_override)
 858                         val = WPAN_SECURITY_DEFAULT;
 859                 else if (ro->secen)
 860                         val = WPAN_SECURITY_ON;
 861                 else
 862                         val = WPAN_SECURITY_OFF;
 863                 break;
 864         case WPAN_SECURITY_LEVEL:
 865                 if (!ro->seclevel_override)
 866                         val = WPAN_SECURITY_LEVEL_DEFAULT;
 867                 else
 868                         val = ro->seclevel;
 869                 break;
 870         default:
 871                 return -ENOPROTOOPT;
 872         }
 873
 874         if (put_user(len, optlen))
 875                 return -EFAULT;
 876         if (copy_to_user(optval, &val, len))
 877                 return -EFAULT;
 878         return 0;
 879 }
 880
 881 static int dgram_setsockopt(struct sock *sk, int level, int optname,
 882                             sockptr_t optval, unsigned int optlen)
 883 {
 884         struct dgram_sock *ro = dgram_sk(sk);
 885         struct net *net = sock_net(sk);
 886         int val;
 887         int err = 0;
 888
 889         if (optlen < sizeof(int))
 890                 return -EINVAL;
 891
 892         if (copy_from_sockptr(&val, optval, sizeof(int)))
 893                 return -EFAULT;
 894
 895         lock_sock(sk);
 896
 897         switch (optname) {
 898         case WPAN_WANTACK:
 899                 ro->want_ack = !!val;
 900                 break;
 901         case WPAN_WANTLQI:
 902                 ro->want_lqi = !!val;
 903                 break;
 904         case WPAN_SECURITY:
 905                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 906                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 907                         err = -EPERM;
 908                         break;
 909                 }
 910
 911                 switch (val) {
 912                 case WPAN_SECURITY_DEFAULT:
 913                         ro->secen_override = 0;
 914                         break;
 915                 case WPAN_SECURITY_ON:
 916                         ro->secen_override = 1;
 917                         ro->secen = 1;
 918                         break;
 919                 case WPAN_SECURITY_OFF:
 920                         ro->secen_override = 1;
 921                         ro->secen = 0;
 922                         break;
 923                 default:
 924                         err = -EINVAL;
 925                         break;
 926                 }
 927                 break;
 928         case WPAN_SECURITY_LEVEL:
 929                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 930                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 931                         err = -EPERM;
 932                         break;
 933                 }
 934
 935                 if (val < WPAN_SECURITY_LEVEL_DEFAULT ||
 936                     val > IEEE802154_SCF_SECLEVEL_ENC_MIC128) {
 937                         err = -EINVAL;
 938                 } else if (val == WPAN_SECURITY_LEVEL_DEFAULT) {
 939                         ro->seclevel_override = 0;
 940                 } else {
 941                         ro->seclevel_override = 1;
 942                         ro->seclevel = val;
 943                 }
 944                 break;
 945         default:
 946                 err = -ENOPROTOOPT;
 947                 break;
 948         }
 949
 950         release_sock(sk);
 951         return err;
 952 }
 953
 954 static struct proto ieee802154_dgram_prot = {
 955         .name           = "IEEE-802.15.4-MAC",
 956         .owner          = THIS_MODULE,
 957         .obj_size       = sizeof(struct dgram_sock),
 958         .init           = dgram_init,
 959         .close          = dgram_close,
 960         .bind           = dgram_bind,
 961         .sendmsg        = dgram_sendmsg,
 962         .recvmsg        = dgram_recvmsg,
 963         .hash           = dgram_hash,
 964         .unhash         = dgram_unhash,
 965         .connect        = dgram_connect,
 966         .disconnect     = dgram_disconnect,
 967         .ioctl          = dgram_ioctl,
 968         .getsockopt     = dgram_getsockopt,
 969         .setsockopt     = dgram_setsockopt,
 970 };
 971
 972 static const struct proto_ops ieee802154_dgram_ops = {
 973         .family            = PF_IEEE802154,
 974         .owner             = THIS_MODULE,
 975         .release           = ieee802154_sock_release,
 976         .bind              = ieee802154_sock_bind,
 977         .connect           = ieee802154_sock_connect,
 978         .socketpair        = sock_no_socketpair,
 979         .accept            = sock_no_accept,
 980         .getname           = sock_no_getname,
 981         .poll              = datagram_poll,
 982         .ioctl             = ieee802154_sock_ioctl,
 983         .gettstamp         = sock_gettstamp,
 984         .listen            = sock_no_listen,
 985         .shutdown          = sock_no_shutdown,
 986         .setsockopt        = sock_common_setsockopt,
 987         .getsockopt        = sock_common_getsockopt,
 988         .sendmsg           = ieee802154_sock_sendmsg,
 989         .recvmsg           = sock_common_recvmsg,
 990         .mmap              = sock_no_mmap,
 991         .sendpage          = sock_no_sendpage,
 992 };
 993
 994 static void ieee802154_sock_destruct(struct sock *sk)
 995 {
 996         skb_queue_purge(&sk->sk_receive_queue);
 997 }
 998
 999 /* Create a socket. Initialise the socket, blank the addresses
1000  * set the state.
1001  */
1002 static int ieee802154_create(struct net *net, struct socket *sock,
1003                              int protocol, int kern)
1004 {
1005         struct sock *sk;
1006         int rc;
1007         struct proto *proto;
1008         const struct proto_ops *ops;
1009
1010         if (!net_eq(net, &init_net))
1011                 return -EAFNOSUPPORT;
1012
1013         switch (sock->type) {
1014         case SOCK_RAW:
1015                 rc = -EPERM;
1016                 if (!capable(CAP_NET_RAW))
1017                         goto out;
1018                 proto = &ieee802154_raw_prot;
1019                 ops = &ieee802154_raw_ops;
1020                 break;
1021         case SOCK_DGRAM:
1022                 proto = &ieee802154_dgram_prot;
1023                 ops = &ieee802154_dgram_ops;
1024                 break;
1025         default:
1026                 rc = -ESOCKTNOSUPPORT;
1027                 goto out;
1028         }
1029
1030         rc = -ENOMEM;
1031         sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto, kern);
1032         if (!sk)
1033                 goto out;
1034         rc = 0;
1035
1036         sock->ops = ops;
1037
1038         sock_init_data(sock, sk);
1039         sk->sk_destruct = ieee802154_sock_destruct;
1040         sk->sk_family = PF_IEEE802154;
1041
1042         /* Checksums on by default */
1043         sock_set_flag(sk, SOCK_ZAPPED);
1044
1045         if (sk->sk_prot->hash) {
1046                 rc = sk->sk_prot->hash(sk);
1047                 if (rc) {
1048                         sk_common_release(sk);
1049                         goto out;
1050                 }
1051         }
1052
1053         if (sk->sk_prot->init) {
1054                 rc = sk->sk_prot->init(sk);
1055                 if (rc)
1056                         sk_common_release(sk);
1057         }
1058 out:
1059         return rc;
1060 }
1061
1062 static const struct net_proto_family ieee802154_family_ops = {
1063         .family         = PF_IEEE802154,
1064         .create         = ieee802154_create,
1065         .owner          = THIS_MODULE,
1066 };
1067
1068 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
1069                           struct packet_type *pt, struct net_device *orig_dev)
1070 {
1071         if (!netif_running(dev))
1072                 goto drop;
1073         pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
1074 #ifdef DEBUG
1075         print_hex_dump_bytes("ieee802154_rcv ",
1076                              DUMP_PREFIX_NONE, skb->data, skb->len);
1077 #endif
1078
1079         if (!net_eq(dev_net(dev), &init_net))
1080                 goto drop;
1081
1082         ieee802154_raw_deliver(dev, skb);
1083
1084         if (dev->type != ARPHRD_IEEE802154)
1085                 goto drop;
1086
1087         if (skb->pkt_type != PACKET_OTHERHOST)
1088                 return ieee802154_dgram_deliver(dev, skb);
1089
1090 drop:
1091         kfree_skb(skb);
1092         return NET_RX_DROP;
1093 }
1094
1095 static struct packet_type ieee802154_packet_type = {
1096         .type = htons(ETH_P_IEEE802154),
1097         .func = ieee802154_rcv,
1098 };
1099
1100 static int __init af_ieee802154_init(void)
1101 {
1102         int rc;
1103
1104         rc = proto_register(&ieee802154_raw_prot, 1);
1105         if (rc)
1106                 goto out;
1107
1108         rc = proto_register(&ieee802154_dgram_prot, 1);
1109         if (rc)
1110                 goto err_dgram;
1111
1112         /* Tell SOCKET that we are alive */
1113         rc = sock_register(&ieee802154_family_ops);
1114         if (rc)
1115                 goto err_sock;
1116         dev_add_pack(&ieee802154_packet_type);
1117
1118         rc = 0;
1119         goto out;
1120
1121 err_sock:
1122         proto_unregister(&ieee802154_dgram_prot);
1123 err_dgram:
1124         proto_unregister(&ieee802154_raw_prot);
1125 out:
1126         return rc;
1127 }
1128
1129 static void __exit af_ieee802154_remove(void)
1130 {
1131         dev_remove_pack(&ieee802154_packet_type);
1132         sock_unregister(PF_IEEE802154);
1133         proto_unregister(&ieee802154_dgram_prot);
1134         proto_unregister(&ieee802154_raw_prot);
1135 }
1136
1137 module_init(af_ieee802154_init);
1138 module_exit(af_ieee802154_remove);
1139
1140 MODULE_LICENSE("GPL");
1141 MODULE_ALIAS_NETPROTO(PF_IEEE802154);