git.oblomov.eu Git - linux-2.6/blob - 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/ieee802154/af_ieee802154.h>
  38 #include <net/ieee802154/netdevice.h>
  39
  40 #include "af802154.h"
  41
  42 #define DBG_DUMP(data, len) { \
  43         int i; \
  44         pr_debug("function: %s: data: len %d:\n", __func__, len); \
  45         for (i = 0; i < len; i++) {\
  46                 pr_debug("%02x: %02x\n", i, (data)[i]); \
  47         } \
  48 }
  49
  50 /*
  51  * Utility function for families
  52  */
  53 struct net_device *ieee802154_get_dev(struct net *net,
  54                 struct ieee802154_addr *addr)
  55 {
  56         struct net_device *dev = NULL;
  57         struct net_device *tmp;
  58         u16 pan_id, short_addr;
  59
  60         switch (addr->addr_type) {
  61         case IEEE802154_ADDR_LONG:
  62                 rtnl_lock();
  63                 dev = dev_getbyhwaddr(net, ARPHRD_IEEE802154, addr->hwaddr);
  64                 if (dev)
  65                         dev_hold(dev);
  66                 rtnl_unlock();
  67                 break;
  68         case IEEE802154_ADDR_SHORT:
  69                 if (addr->pan_id == 0xffff ||
  70                     addr->short_addr == IEEE802154_ADDR_UNDEF ||
  71                     addr->short_addr == 0xffff)
  72                         break;
  73
  74                 rtnl_lock();
  75
  76                 for_each_netdev(net, tmp) {
  77                         if (tmp->type != ARPHRD_IEEE802154)
  78                                 continue;
  79
  80                         pan_id = ieee802154_mlme_ops(tmp)->get_pan_id(tmp);
  81                         short_addr =
  82                                 ieee802154_mlme_ops(tmp)->get_short_addr(tmp);
  83
  84                         if (pan_id == addr->pan_id &&
  85                             short_addr == addr->short_addr) {
  86                                 dev = tmp;
  87                                 dev_hold(dev);
  88                                 break;
  89                         }
  90                 }
  91
  92                 rtnl_unlock();
  93                 break;
  94         default:
  95                 pr_warning("Unsupported ieee802154 address type: %d\n",
  96                                 addr->addr_type);
  97                 break;
  98         }
  99
 100         return dev;
 101 }
 102
 103 static int ieee802154_sock_release(struct socket *sock)
 104 {
 105         struct sock *sk = sock->sk;
 106
 107         if (sk) {
 108                 sock->sk = NULL;
 109                 sk->sk_prot->close(sk, 0);
 110         }
 111         return 0;
 112 }
 113 static int ieee802154_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 114                 struct msghdr *msg, size_t len)
 115 {
 116         struct sock *sk = sock->sk;
 117
 118         return sk->sk_prot->sendmsg(iocb, sk, msg, len);
 119 }
 120
 121 static int ieee802154_sock_bind(struct socket *sock, struct sockaddr *uaddr,
 122                 int addr_len)
 123 {
 124         struct sock *sk = sock->sk;
 125
 126         if (sk->sk_prot->bind)
 127                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 128
 129         return sock_no_bind(sock, uaddr, addr_len);
 130 }
 131
 132 static int ieee802154_sock_connect(struct socket *sock, struct sockaddr *uaddr,
 133                         int addr_len, int flags)
 134 {
 135         struct sock *sk = sock->sk;
 136
 137         if (uaddr->sa_family == AF_UNSPEC)
 138                 return sk->sk_prot->disconnect(sk, flags);
 139
 140         return sk->sk_prot->connect(sk, uaddr, addr_len);
 141 }
 142
 143 static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
 144                 unsigned int cmd)
 145 {
 146         struct ifreq ifr;
 147         int ret = -EINVAL;
 148         struct net_device *dev;
 149
 150         if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
 151                 return -EFAULT;
 152
 153         ifr.ifr_name[IFNAMSIZ-1] = 0;
 154
 155         dev_load(sock_net(sk), ifr.ifr_name);
 156         dev = dev_get_by_name(sock_net(sk), ifr.ifr_name);
 157         if (dev->type == ARPHRD_IEEE802154 ||
 158             dev->type == ARPHRD_IEEE802154_PHY)
 159                 ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);
 160
 161         if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))
 162                 ret = -EFAULT;
 163         dev_put(dev);
 164
 165         return ret;
 166 }
 167
 168 static int ieee802154_sock_ioctl(struct socket *sock, unsigned int cmd,
 169                 unsigned long arg)
 170 {
 171         struct sock *sk = sock->sk;
 172
 173         switch (cmd) {
 174         case SIOCGSTAMP:
 175                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 176         case SIOCGSTAMPNS:
 177                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 178         case SIOCGIFADDR:
 179         case SIOCSIFADDR:
 180                 return ieee802154_dev_ioctl(sk, (struct ifreq __user *)arg,
 181                                 cmd);
 182         default:
 183                 if (!sk->sk_prot->ioctl)
 184                         return -ENOIOCTLCMD;
 185                 return sk->sk_prot->ioctl(sk, cmd, arg);
 186         }
 187 }
 188
 189 static const struct proto_ops ieee802154_raw_ops = {
 190         .family            = PF_IEEE802154,
 191         .owner             = THIS_MODULE,
 192         .release           = ieee802154_sock_release,
 193         .bind              = ieee802154_sock_bind,
 194         .connect           = ieee802154_sock_connect,
 195         .socketpair        = sock_no_socketpair,
 196         .accept            = sock_no_accept,
 197         .getname           = sock_no_getname,
 198         .poll              = datagram_poll,
 199         .ioctl             = ieee802154_sock_ioctl,
 200         .listen            = sock_no_listen,
 201         .shutdown          = sock_no_shutdown,
 202         .setsockopt        = sock_common_setsockopt,
 203         .getsockopt        = sock_common_getsockopt,
 204         .sendmsg           = ieee802154_sock_sendmsg,
 205         .recvmsg           = sock_common_recvmsg,
 206         .mmap              = sock_no_mmap,
 207         .sendpage          = sock_no_sendpage,
 208 #ifdef CONFIG_COMPAT
 209         .compat_setsockopt = compat_sock_common_setsockopt,
 210         .compat_getsockopt = compat_sock_common_getsockopt,
 211 #endif
 212 };
 213
 214 static const struct proto_ops ieee802154_dgram_ops = {
 215         .family            = PF_IEEE802154,
 216         .owner             = THIS_MODULE,
 217         .release           = ieee802154_sock_release,
 218         .bind              = ieee802154_sock_bind,
 219         .connect           = ieee802154_sock_connect,
 220         .socketpair        = sock_no_socketpair,
 221         .accept            = sock_no_accept,
 222         .getname           = sock_no_getname,
 223         .poll              = datagram_poll,
 224         .ioctl             = ieee802154_sock_ioctl,
 225         .listen            = sock_no_listen,
 226         .shutdown          = sock_no_shutdown,
 227         .setsockopt        = sock_common_setsockopt,
 228         .getsockopt        = sock_common_getsockopt,
 229         .sendmsg           = ieee802154_sock_sendmsg,
 230         .recvmsg           = sock_common_recvmsg,
 231         .mmap              = sock_no_mmap,
 232         .sendpage          = sock_no_sendpage,
 233 #ifdef CONFIG_COMPAT
 234         .compat_setsockopt = compat_sock_common_setsockopt,
 235         .compat_getsockopt = compat_sock_common_getsockopt,
 236 #endif
 237 };
 238
 239
 240 /*
 241  * Create a socket. Initialise the socket, blank the addresses
 242  * set the state.
 243  */
 244 static int ieee802154_create(struct net *net, struct socket *sock,
 245                 int protocol)
 246 {
 247         struct sock *sk;
 248         int rc;
 249         struct proto *proto;
 250         const struct proto_ops *ops;
 251
 252         if (net != &init_net)
 253                 return -EAFNOSUPPORT;
 254
 255         switch (sock->type) {
 256         case SOCK_RAW:
 257                 proto = &ieee802154_raw_prot;
 258                 ops = &ieee802154_raw_ops;
 259                 break;
 260         case SOCK_DGRAM:
 261                 proto = &ieee802154_dgram_prot;
 262                 ops = &ieee802154_dgram_ops;
 263                 break;
 264         default:
 265                 rc = -ESOCKTNOSUPPORT;
 266                 goto out;
 267         }
 268
 269         rc = -ENOMEM;
 270         sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto);
 271         if (!sk)
 272                 goto out;
 273         rc = 0;
 274
 275         sock->ops = ops;
 276
 277         sock_init_data(sock, sk);
 278         /* FIXME: sk->sk_destruct */
 279         sk->sk_family = PF_IEEE802154;
 280
 281         /* Checksums on by default */
 282         sock_set_flag(sk, SOCK_ZAPPED);
 283
 284         if (sk->sk_prot->hash)
 285                 sk->sk_prot->hash(sk);
 286
 287         if (sk->sk_prot->init) {
 288                 rc = sk->sk_prot->init(sk);
 289                 if (rc)
 290                         sk_common_release(sk);
 291         }
 292 out:
 293         return rc;
 294 }
 295
 296 static struct net_proto_family ieee802154_family_ops = {
 297         .family         = PF_IEEE802154,
 298         .create         = ieee802154_create,
 299         .owner          = THIS_MODULE,
 300 };
 301
 302 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
 303         struct packet_type *pt, struct net_device *orig_dev)
 304 {
 305         DBG_DUMP(skb->data, skb->len);
 306         if (!netif_running(dev))
 307                 return -ENODEV;
 308         pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
 309
 310         if (!net_eq(dev_net(dev), &init_net))
 311                 goto drop;
 312
 313         ieee802154_raw_deliver(dev, skb);
 314
 315         if (dev->type != ARPHRD_IEEE802154)
 316                 goto drop;
 317
 318         if (skb->pkt_type != PACKET_OTHERHOST)
 319                 return ieee802154_dgram_deliver(dev, skb);
 320
 321 drop:
 322         kfree_skb(skb);
 323         return NET_RX_DROP;
 324 }
 325
 326
 327 static struct packet_type ieee802154_packet_type = {
 328         .type = __constant_htons(ETH_P_IEEE802154),
 329         .func = ieee802154_rcv,
 330 };
 331
 332 static int __init af_ieee802154_init(void)
 333 {
 334         int rc = -EINVAL;
 335
 336         rc = proto_register(&ieee802154_raw_prot, 1);
 337         if (rc)
 338                 goto out;
 339
 340         rc = proto_register(&ieee802154_dgram_prot, 1);
 341         if (rc)
 342                 goto err_dgram;
 343
 344         /* Tell SOCKET that we are alive */
 345         rc = sock_register(&ieee802154_family_ops);
 346         if (rc)
 347                 goto err_sock;
 348         dev_add_pack(&ieee802154_packet_type);
 349
 350         rc = 0;
 351         goto out;
 352
 353 err_sock:
 354         proto_unregister(&ieee802154_dgram_prot);
 355 err_dgram:
 356         proto_unregister(&ieee802154_raw_prot);
 357 out:
 358         return rc;
 359 }
 360 static void __exit af_ieee802154_remove(void)
 361 {
 362         dev_remove_pack(&ieee802154_packet_type);
 363         sock_unregister(PF_IEEE802154);
 364         proto_unregister(&ieee802154_dgram_prot);
 365         proto_unregister(&ieee802154_raw_prot);
 366 }
 367
 368 module_init(af_ieee802154_init);
 369 module_exit(af_ieee802154_remove);
 370
 371 MODULE_LICENSE("GPL");
 372 MODULE_ALIAS_NETPROTO(PF_IEEE802154);