net/ieee802154/af_ieee802154.c

   1 /*
   2  * IEEE802154.4 socket interface
   3  *
   4  * Copyright 2007, 2008 Siemens AG
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Written by:
  20  * Sergey Lapin <slapin@ossfans.org>
  21  * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
  22  */
  23
  24 #include <linux/net.h>
  25 #include <linux/capability.h>
  26 #include <linux/module.h>
  27 #include <linux/if_arp.h>
  28 #include <linux/if.h>
  29 #include <linux/termios.h>      /* For TIOCOUTQ/INQ */
  30 #include <linux/list.h>
  31 #include <linux/slab.h>
  32 #include <net/datalink.h>
  33 #include <net/psnap.h>
  34 #include <net/sock.h>
  35 #include <net/tcp_states.h>
  36 #include <net/route.h>
  37
  38 #include <net/af_ieee802154.h>
  39 #include <net/ieee802154_netdev.h>
  40
  41 #include "af802154.h"
  42
  43 /*
  44  * Utility function for families
  45  */
  46 struct net_device*
  47 ieee802154_get_dev(struct net *net, const struct ieee802154_addr *addr)
  48 {
  49         struct net_device *dev = NULL;
  50         struct net_device *tmp;
  51         __le16 pan_id, short_addr;
  52         u8 hwaddr[IEEE802154_ADDR_LEN];
  53
  54         switch (addr->mode) {
  55         case IEEE802154_ADDR_LONG:
  56                 ieee802154_devaddr_to_raw(hwaddr, addr->extended_addr);
  57                 rcu_read_lock();
  58                 dev = dev_getbyhwaddr_rcu(net, ARPHRD_IEEE802154, hwaddr);
  59                 if (dev)
  60                         dev_hold(dev);
  61                 rcu_read_unlock();
  62                 break;
  63         case IEEE802154_ADDR_SHORT:
  64                 if (addr->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST) ||
  65                     addr->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
  66                     addr->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST))
  67                         break;
  68
  69                 rtnl_lock();
  70
  71                 for_each_netdev(net, tmp) {
  72                         if (tmp->type != ARPHRD_IEEE802154)
  73                                 continue;
  74
  75                         pan_id = ieee802154_mlme_ops(tmp)->get_pan_id(tmp);
  76                         short_addr =
  77                                 ieee802154_mlme_ops(tmp)->get_short_addr(tmp);
  78
  79                         if (pan_id == addr->pan_id &&
  80                             short_addr == addr->short_addr) {
  81                                 dev = tmp;
  82                                 dev_hold(dev);
  83                                 break;
  84                         }
  85                 }
  86
  87                 rtnl_unlock();
  88                 break;
  89         default:
  90                 pr_warning("Unsupported ieee802154 address type: %d\n",
  91                                 addr->mode);
  92                 break;
  93         }
  94
  95         return dev;
  96 }
  97
  98 static int ieee802154_sock_release(struct socket *sock)
  99 {
 100         struct sock *sk = sock->sk;
 101
 102         if (sk) {
 103                 sock->sk = NULL;
 104                 sk->sk_prot->close(sk, 0);
 105         }
 106         return 0;
 107 }
 108 static int ieee802154_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 109                 struct msghdr *msg, size_t len)
 110 {
 111         struct sock *sk = sock->sk;
 112
 113         return sk->sk_prot->sendmsg(iocb, sk, msg, len);
 114 }
 115
 116 static int ieee802154_sock_bind(struct socket *sock, struct sockaddr *uaddr,
 117                 int addr_len)
 118 {
 119         struct sock *sk = sock->sk;
 120
 121         if (sk->sk_prot->bind)
 122                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 123
 124         return sock_no_bind(sock, uaddr, addr_len);
 125 }
 126
 127 static int ieee802154_sock_connect(struct socket *sock, struct sockaddr *uaddr,
 128                         int addr_len, int flags)
 129 {
 130         struct sock *sk = sock->sk;
 131
 132         if (addr_len < sizeof(uaddr->sa_family))
 133                 return -EINVAL;
 134
 135         if (uaddr->sa_family == AF_UNSPEC)
 136                 return sk->sk_prot->disconnect(sk, flags);
 137
 138         return sk->sk_prot->connect(sk, uaddr, addr_len);
 139 }
 140
 141 static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
 142                 unsigned int cmd)
 143 {
 144         struct ifreq ifr;
 145         int ret = -ENOIOCTLCMD;
 146         struct net_device *dev;
 147
 148         if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
 149                 return -EFAULT;
 150
 151         ifr.ifr_name[IFNAMSIZ-1] = 0;
 152
 153         dev_load(sock_net(sk), ifr.ifr_name);
 154         dev = dev_get_by_name(sock_net(sk), ifr.ifr_name);
 155
 156         if (!dev)
 157                 return -ENODEV;
 158
 159         if (dev->type == ARPHRD_IEEE802154 && dev->netdev_ops->ndo_do_ioctl)
 160                 ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);
 161
 162         if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))
 163                 ret = -EFAULT;
 164         dev_put(dev);
 165
 166         return ret;
 167 }
 168
 169 static int ieee802154_sock_ioctl(struct socket *sock, unsigned int cmd,
 170                 unsigned long arg)
 171 {
 172         struct sock *sk = sock->sk;
 173
 174         switch (cmd) {
 175         case SIOCGSTAMP:
 176                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 177         case SIOCGSTAMPNS:
 178                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 179         case SIOCGIFADDR:
 180         case SIOCSIFADDR:
 181                 return ieee802154_dev_ioctl(sk, (struct ifreq __user *)arg,
 182                                 cmd);
 183         default:
 184                 if (!sk->sk_prot->ioctl)
 185                         return -ENOIOCTLCMD;
 186                 return sk->sk_prot->ioctl(sk, cmd, arg);
 187         }
 188 }
 189
 190 static const struct proto_ops ieee802154_raw_ops = {
 191         .family            = PF_IEEE802154,
 192         .owner             = THIS_MODULE,
 193         .release           = ieee802154_sock_release,
 194         .bind              = ieee802154_sock_bind,
 195         .connect           = ieee802154_sock_connect,
 196         .socketpair        = sock_no_socketpair,
 197         .accept            = sock_no_accept,
 198         .getname           = sock_no_getname,
 199         .poll              = datagram_poll,
 200         .ioctl             = ieee802154_sock_ioctl,
 201         .listen            = sock_no_listen,
 202         .shutdown          = sock_no_shutdown,
 203         .setsockopt        = sock_common_setsockopt,
 204         .getsockopt        = sock_common_getsockopt,
 205         .sendmsg           = ieee802154_sock_sendmsg,
 206         .recvmsg           = sock_common_recvmsg,
 207         .mmap              = sock_no_mmap,
 208         .sendpage          = sock_no_sendpage,
 209 #ifdef CONFIG_COMPAT
 210         .compat_setsockopt = compat_sock_common_setsockopt,
 211         .compat_getsockopt = compat_sock_common_getsockopt,
 212 #endif
 213 };
 214
 215 static const struct proto_ops ieee802154_dgram_ops = {
 216         .family            = PF_IEEE802154,
 217         .owner             = THIS_MODULE,
 218         .release           = ieee802154_sock_release,
 219         .bind              = ieee802154_sock_bind,
 220         .connect           = ieee802154_sock_connect,
 221         .socketpair        = sock_no_socketpair,
 222         .accept            = sock_no_accept,
 223         .getname           = sock_no_getname,
 224         .poll              = datagram_poll,
 225         .ioctl             = ieee802154_sock_ioctl,
 226         .listen            = sock_no_listen,
 227         .shutdown          = sock_no_shutdown,
 228         .setsockopt        = sock_common_setsockopt,
 229         .getsockopt        = sock_common_getsockopt,
 230         .sendmsg           = ieee802154_sock_sendmsg,
 231         .recvmsg           = sock_common_recvmsg,
 232         .mmap              = sock_no_mmap,
 233         .sendpage          = sock_no_sendpage,
 234 #ifdef CONFIG_COMPAT
 235         .compat_setsockopt = compat_sock_common_setsockopt,
 236         .compat_getsockopt = compat_sock_common_getsockopt,
 237 #endif
 238 };
 239
 240
 241 /*
 242  * Create a socket. Initialise the socket, blank the addresses
 243  * set the state.
 244  */
 245 static int ieee802154_create(struct net *net, struct socket *sock,
 246                              int protocol, int kern)
 247 {
 248         struct sock *sk;
 249         int rc;
 250         struct proto *proto;
 251         const struct proto_ops *ops;
 252
 253         if (!net_eq(net, &init_net))
 254                 return -EAFNOSUPPORT;
 255
 256         switch (sock->type) {
 257         case SOCK_RAW:
 258                 proto = &ieee802154_raw_prot;
 259                 ops = &ieee802154_raw_ops;
 260                 break;
 261         case SOCK_DGRAM:
 262                 proto = &ieee802154_dgram_prot;
 263                 ops = &ieee802154_dgram_ops;
 264                 break;
 265         default:
 266                 rc = -ESOCKTNOSUPPORT;
 267                 goto out;
 268         }
 269
 270         rc = -ENOMEM;
 271         sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto);
 272         if (!sk)
 273                 goto out;
 274         rc = 0;
 275
 276         sock->ops = ops;
 277
 278         sock_init_data(sock, sk);
 279         /* FIXME: sk->sk_destruct */
 280         sk->sk_family = PF_IEEE802154;
 281
 282         /* Checksums on by default */
 283         sock_set_flag(sk, SOCK_ZAPPED);
 284
 285         if (sk->sk_prot->hash)
 286                 sk->sk_prot->hash(sk);
 287
 288         if (sk->sk_prot->init) {
 289                 rc = sk->sk_prot->init(sk);
 290                 if (rc)
 291                         sk_common_release(sk);
 292         }
 293 out:
 294         return rc;
 295 }
 296
 297 static const struct net_proto_family ieee802154_family_ops = {
 298         .family         = PF_IEEE802154,
 299         .create         = ieee802154_create,
 300         .owner          = THIS_MODULE,
 301 };
 302
 303 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
 304         struct packet_type *pt, struct net_device *orig_dev)
 305 {
 306         if (!netif_running(dev))
 307                 goto drop;
 308         pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
 309 #ifdef DEBUG
 310         print_hex_dump_bytes("ieee802154_rcv ", DUMP_PREFIX_NONE, skb->data, skb->len);
 311 #endif
 312
 313         if (!net_eq(dev_net(dev), &init_net))
 314                 goto drop;
 315
 316         ieee802154_raw_deliver(dev, skb);
 317
 318         if (dev->type != ARPHRD_IEEE802154)
 319                 goto drop;
 320
 321         if (skb->pkt_type != PACKET_OTHERHOST)
 322                 return ieee802154_dgram_deliver(dev, skb);
 323
 324 drop:
 325         kfree_skb(skb);
 326         return NET_RX_DROP;
 327 }
 328
 329
 330 static struct packet_type ieee802154_packet_type = {
 331         .type = htons(ETH_P_IEEE802154),
 332         .func = ieee802154_rcv,
 333 };
 334
 335 static int __init af_ieee802154_init(void)
 336 {
 337         int rc = -EINVAL;
 338
 339         rc = proto_register(&ieee802154_raw_prot, 1);
 340         if (rc)
 341                 goto out;
 342
 343         rc = proto_register(&ieee802154_dgram_prot, 1);
 344         if (rc)
 345                 goto err_dgram;
 346
 347         /* Tell SOCKET that we are alive */
 348         rc = sock_register(&ieee802154_family_ops);
 349         if (rc)
 350                 goto err_sock;
 351         dev_add_pack(&ieee802154_packet_type);
 352
 353         rc = 0;
 354         goto out;
 355
 356 err_sock:
 357         proto_unregister(&ieee802154_dgram_prot);
 358 err_dgram:
 359         proto_unregister(&ieee802154_raw_prot);
 360 out:
 361         return rc;
 362 }
 363 static void __exit af_ieee802154_remove(void)
 364 {
 365         dev_remove_pack(&ieee802154_packet_type);
 366         sock_unregister(PF_IEEE802154);
 367         proto_unregister(&ieee802154_dgram_prot);
 368         proto_unregister(&ieee802154_raw_prot);
 369 }
 370
 371 module_init(af_ieee802154_init);
 372 module_exit(af_ieee802154_remove);
 373
 374 MODULE_LICENSE("GPL");
 375 MODULE_ALIAS_NETPROTO(PF_IEEE802154);