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 <net/datalink.h>
  32 #include <net/psnap.h>
  33 #include <net/sock.h>
  34 #include <net/tcp_states.h>
  35 #include <net/route.h>
  36
  37 #include <net/af_ieee802154.h>
  38 #include <net/ieee802154_netdev.h>
  39
  40 #include "af802154.h"
  41
  42 /*
  43  * Utility function for families
  44  */
  45 struct net_device *ieee802154_get_dev(struct net *net,
  46                 struct ieee802154_addr *addr)
  47 {
  48         struct net_device *dev = NULL;
  49         struct net_device *tmp;
  50         u16 pan_id, short_addr;
  51
  52         switch (addr->addr_type) {
  53         case IEEE802154_ADDR_LONG:
  54                 rtnl_lock();
  55                 dev = dev_getbyhwaddr(net, ARPHRD_IEEE802154, addr->hwaddr);
  56                 if (dev)
  57                         dev_hold(dev);
  58                 rtnl_unlock();
  59                 break;
  60         case IEEE802154_ADDR_SHORT:
  61                 if (addr->pan_id == 0xffff ||
  62                     addr->short_addr == IEEE802154_ADDR_UNDEF ||
  63                     addr->short_addr == 0xffff)
  64                         break;
  65
  66                 rtnl_lock();
  67
  68                 for_each_netdev(net, tmp) {
  69                         if (tmp->type != ARPHRD_IEEE802154)
  70                                 continue;
  71
  72                         pan_id = ieee802154_mlme_ops(tmp)->get_pan_id(tmp);
  73                         short_addr =
  74                                 ieee802154_mlme_ops(tmp)->get_short_addr(tmp);
  75
  76                         if (pan_id == addr->pan_id &&
  77                             short_addr == addr->short_addr) {
  78                                 dev = tmp;
  79                                 dev_hold(dev);
  80                                 break;
  81                         }
  82                 }
  83
  84                 rtnl_unlock();
  85                 break;
  86         default:
  87                 pr_warning("Unsupported ieee802154 address type: %d\n",
  88                                 addr->addr_type);
  89                 break;
  90         }
  91
  92         return dev;
  93 }
  94
  95 static int ieee802154_sock_release(struct socket *sock)
  96 {
  97         struct sock *sk = sock->sk;
  98
  99         if (sk) {
 100                 sock->sk = NULL;
 101                 sk->sk_prot->close(sk, 0);
 102         }
 103         return 0;
 104 }
 105 static int ieee802154_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 106                 struct msghdr *msg, size_t len)
 107 {
 108         struct sock *sk = sock->sk;
 109
 110         return sk->sk_prot->sendmsg(iocb, sk, msg, len);
 111 }
 112
 113 static int ieee802154_sock_bind(struct socket *sock, struct sockaddr *uaddr,
 114                 int addr_len)
 115 {
 116         struct sock *sk = sock->sk;
 117
 118         if (sk->sk_prot->bind)
 119                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 120
 121         return sock_no_bind(sock, uaddr, addr_len);
 122 }
 123
 124 static int ieee802154_sock_connect(struct socket *sock, struct sockaddr *uaddr,
 125                         int addr_len, int flags)
 126 {
 127         struct sock *sk = sock->sk;
 128
 129         if (addr_len < sizeof(uaddr->sa_family))
 130                 return -EINVAL;
 131
 132         if (uaddr->sa_family == AF_UNSPEC)
 133                 return sk->sk_prot->disconnect(sk, flags);
 134
 135         return sk->sk_prot->connect(sk, uaddr, addr_len);
 136 }
 137
 138 static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
 139                 unsigned int cmd)
 140 {
 141         struct ifreq ifr;
 142         int ret = -ENOIOCTLCMD;
 143         struct net_device *dev;
 144
 145         if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
 146                 return -EFAULT;
 147
 148         ifr.ifr_name[IFNAMSIZ-1] = 0;
 149
 150         dev_load(sock_net(sk), ifr.ifr_name);
 151         dev = dev_get_by_name(sock_net(sk), ifr.ifr_name);
 152
 153         if (dev->type == ARPHRD_IEEE802154 && dev->netdev_ops->ndo_do_ioctl)
 154                 ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);
 155
 156         if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))
 157                 ret = -EFAULT;
 158         dev_put(dev);
 159
 160         return ret;
 161 }
 162
 163 static int ieee802154_sock_ioctl(struct socket *sock, unsigned int cmd,
 164                 unsigned long arg)
 165 {
 166         struct sock *sk = sock->sk;
 167
 168         switch (cmd) {
 169         case SIOCGSTAMP:
 170                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 171         case SIOCGSTAMPNS:
 172                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 173         case SIOCGIFADDR:
 174         case SIOCSIFADDR:
 175                 return ieee802154_dev_ioctl(sk, (struct ifreq __user *)arg,
 176                                 cmd);
 177         default:
 178                 if (!sk->sk_prot->ioctl)
 179                         return -ENOIOCTLCMD;
 180                 return sk->sk_prot->ioctl(sk, cmd, arg);
 181         }
 182 }
 183
 184 static const struct proto_ops ieee802154_raw_ops = {
 185         .family            = PF_IEEE802154,
 186         .owner             = THIS_MODULE,
 187         .release           = ieee802154_sock_release,
 188         .bind              = ieee802154_sock_bind,
 189         .connect           = ieee802154_sock_connect,
 190         .socketpair        = sock_no_socketpair,
 191         .accept            = sock_no_accept,
 192         .getname           = sock_no_getname,
 193         .poll              = datagram_poll,
 194         .ioctl             = ieee802154_sock_ioctl,
 195         .listen            = sock_no_listen,
 196         .shutdown          = sock_no_shutdown,
 197         .setsockopt        = sock_common_setsockopt,
 198         .getsockopt        = sock_common_getsockopt,
 199         .sendmsg           = ieee802154_sock_sendmsg,
 200         .recvmsg           = sock_common_recvmsg,
 201         .mmap              = sock_no_mmap,
 202         .sendpage          = sock_no_sendpage,
 203 #ifdef CONFIG_COMPAT
 204         .compat_setsockopt = compat_sock_common_setsockopt,
 205         .compat_getsockopt = compat_sock_common_getsockopt,
 206 #endif
 207 };
 208
 209 static const struct proto_ops ieee802154_dgram_ops = {
 210         .family            = PF_IEEE802154,
 211         .owner             = THIS_MODULE,
 212         .release           = ieee802154_sock_release,
 213         .bind              = ieee802154_sock_bind,
 214         .connect           = ieee802154_sock_connect,
 215         .socketpair        = sock_no_socketpair,
 216         .accept            = sock_no_accept,
 217         .getname           = sock_no_getname,
 218         .poll              = datagram_poll,
 219         .ioctl             = ieee802154_sock_ioctl,
 220         .listen            = sock_no_listen,
 221         .shutdown          = sock_no_shutdown,
 222         .setsockopt        = sock_common_setsockopt,
 223         .getsockopt        = sock_common_getsockopt,
 224         .sendmsg           = ieee802154_sock_sendmsg,
 225         .recvmsg           = sock_common_recvmsg,
 226         .mmap              = sock_no_mmap,
 227         .sendpage          = sock_no_sendpage,
 228 #ifdef CONFIG_COMPAT
 229         .compat_setsockopt = compat_sock_common_setsockopt,
 230         .compat_getsockopt = compat_sock_common_getsockopt,
 231 #endif
 232 };
 233
 234
 235 /*
 236  * Create a socket. Initialise the socket, blank the addresses
 237  * set the state.
 238  */
 239 static int ieee802154_create(struct net *net, struct socket *sock,
 240                              int protocol, int kern)
 241 {
 242         struct sock *sk;
 243         int rc;
 244         struct proto *proto;
 245         const struct proto_ops *ops;
 246
 247         if (!net_eq(net, &init_net))
 248                 return -EAFNOSUPPORT;
 249
 250         switch (sock->type) {
 251         case SOCK_RAW:
 252                 proto = &ieee802154_raw_prot;
 253                 ops = &ieee802154_raw_ops;
 254                 break;
 255         case SOCK_DGRAM:
 256                 proto = &ieee802154_dgram_prot;
 257                 ops = &ieee802154_dgram_ops;
 258                 break;
 259         default:
 260                 rc = -ESOCKTNOSUPPORT;
 261                 goto out;
 262         }
 263
 264         rc = -ENOMEM;
 265         sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto);
 266         if (!sk)
 267                 goto out;
 268         rc = 0;
 269
 270         sock->ops = ops;
 271
 272         sock_init_data(sock, sk);
 273         /* FIXME: sk->sk_destruct */
 274         sk->sk_family = PF_IEEE802154;
 275
 276         /* Checksums on by default */
 277         sock_set_flag(sk, SOCK_ZAPPED);
 278
 279         if (sk->sk_prot->hash)
 280                 sk->sk_prot->hash(sk);
 281
 282         if (sk->sk_prot->init) {
 283                 rc = sk->sk_prot->init(sk);
 284                 if (rc)
 285                         sk_common_release(sk);
 286         }
 287 out:
 288         return rc;
 289 }
 290
 291 static const struct net_proto_family ieee802154_family_ops = {
 292         .family         = PF_IEEE802154,
 293         .create         = ieee802154_create,
 294         .owner          = THIS_MODULE,
 295 };
 296
 297 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
 298         struct packet_type *pt, struct net_device *orig_dev)
 299 {
 300         if (!netif_running(dev))
 301                 return -ENODEV;
 302         pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
 303 #ifdef DEBUG
 304         print_hex_dump_bytes("ieee802154_rcv ", DUMP_PREFIX_NONE, skb->data, skb->len);
 305 #endif
 306
 307         if (!net_eq(dev_net(dev), &init_net))
 308                 goto drop;
 309
 310         ieee802154_raw_deliver(dev, skb);
 311
 312         if (dev->type != ARPHRD_IEEE802154)
 313                 goto drop;
 314
 315         if (skb->pkt_type != PACKET_OTHERHOST)
 316                 return ieee802154_dgram_deliver(dev, skb);
 317
 318 drop:
 319         kfree_skb(skb);
 320         return NET_RX_DROP;
 321 }
 322
 323
 324 static struct packet_type ieee802154_packet_type = {
 325         .type = __constant_htons(ETH_P_IEEE802154),
 326         .func = ieee802154_rcv,
 327 };
 328
 329 static int __init af_ieee802154_init(void)
 330 {
 331         int rc = -EINVAL;
 332
 333         rc = proto_register(&ieee802154_raw_prot, 1);
 334         if (rc)
 335                 goto out;
 336
 337         rc = proto_register(&ieee802154_dgram_prot, 1);
 338         if (rc)
 339                 goto err_dgram;
 340
 341         /* Tell SOCKET that we are alive */
 342         rc = sock_register(&ieee802154_family_ops);
 343         if (rc)
 344                 goto err_sock;
 345         dev_add_pack(&ieee802154_packet_type);
 346
 347         rc = 0;
 348         goto out;
 349
 350 err_sock:
 351         proto_unregister(&ieee802154_dgram_prot);
 352 err_dgram:
 353         proto_unregister(&ieee802154_raw_prot);
 354 out:
 355         return rc;
 356 }
 357 static void __exit af_ieee802154_remove(void)
 358 {
 359         dev_remove_pack(&ieee802154_packet_type);
 360         sock_unregister(PF_IEEE802154);
 361         proto_unregister(&ieee802154_dgram_prot);
 362         proto_unregister(&ieee802154_raw_prot);
 363 }
 364
 365 module_init(af_ieee802154_init);
 366 module_exit(af_ieee802154_remove);
 367
 368 MODULE_LICENSE("GPL");
 369 MODULE_ALIAS_NETPROTO(PF_IEEE802154);