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