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 (uaddr->sa_family == AF_UNSPEC)
 130                 return sk->sk_prot->disconnect(sk, flags);
 131
 132         return sk->sk_prot->connect(sk, uaddr, addr_len);
 133 }
 134
 135 static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
 136                 unsigned int cmd)
 137 {
 138         struct ifreq ifr;
 139         int ret = -ENOIOCTLCMD;
 140         struct net_device *dev;
 141
 142         if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
 143                 return -EFAULT;
 144
 145         ifr.ifr_name[IFNAMSIZ-1] = 0;
 146
 147         dev_load(sock_net(sk), ifr.ifr_name);
 148         dev = dev_get_by_name(sock_net(sk), ifr.ifr_name);
 149
 150         if (dev->type == ARPHRD_IEEE802154 && dev->netdev_ops->ndo_do_ioctl)
 151                 ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);
 152
 153         if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))
 154                 ret = -EFAULT;
 155         dev_put(dev);
 156
 157         return ret;
 158 }
 159
 160 static int ieee802154_sock_ioctl(struct socket *sock, unsigned int cmd,
 161                 unsigned long arg)
 162 {
 163         struct sock *sk = sock->sk;
 164
 165         switch (cmd) {
 166         case SIOCGSTAMP:
 167                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 168         case SIOCGSTAMPNS:
 169                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 170         case SIOCGIFADDR:
 171         case SIOCSIFADDR:
 172                 return ieee802154_dev_ioctl(sk, (struct ifreq __user *)arg,
 173                                 cmd);
 174         default:
 175                 if (!sk->sk_prot->ioctl)
 176                         return -ENOIOCTLCMD;
 177                 return sk->sk_prot->ioctl(sk, cmd, arg);
 178         }
 179 }
 180
 181 static const struct proto_ops ieee802154_raw_ops = {
 182         .family            = PF_IEEE802154,
 183         .owner             = THIS_MODULE,
 184         .release           = ieee802154_sock_release,
 185         .bind              = ieee802154_sock_bind,
 186         .connect           = ieee802154_sock_connect,
 187         .socketpair        = sock_no_socketpair,
 188         .accept            = sock_no_accept,
 189         .getname           = sock_no_getname,
 190         .poll              = datagram_poll,
 191         .ioctl             = ieee802154_sock_ioctl,
 192         .listen            = sock_no_listen,
 193         .shutdown          = sock_no_shutdown,
 194         .setsockopt        = sock_common_setsockopt,
 195         .getsockopt        = sock_common_getsockopt,
 196         .sendmsg           = ieee802154_sock_sendmsg,
 197         .recvmsg           = sock_common_recvmsg,
 198         .mmap              = sock_no_mmap,
 199         .sendpage          = sock_no_sendpage,
 200 #ifdef CONFIG_COMPAT
 201         .compat_setsockopt = compat_sock_common_setsockopt,
 202         .compat_getsockopt = compat_sock_common_getsockopt,
 203 #endif
 204 };
 205
 206 static const struct proto_ops ieee802154_dgram_ops = {
 207         .family            = PF_IEEE802154,
 208         .owner             = THIS_MODULE,
 209         .release           = ieee802154_sock_release,
 210         .bind              = ieee802154_sock_bind,
 211         .connect           = ieee802154_sock_connect,
 212         .socketpair        = sock_no_socketpair,
 213         .accept            = sock_no_accept,
 214         .getname           = sock_no_getname,
 215         .poll              = datagram_poll,
 216         .ioctl             = ieee802154_sock_ioctl,
 217         .listen            = sock_no_listen,
 218         .shutdown          = sock_no_shutdown,
 219         .setsockopt        = sock_common_setsockopt,
 220         .getsockopt        = sock_common_getsockopt,
 221         .sendmsg           = ieee802154_sock_sendmsg,
 222         .recvmsg           = sock_common_recvmsg,
 223         .mmap              = sock_no_mmap,
 224         .sendpage          = sock_no_sendpage,
 225 #ifdef CONFIG_COMPAT
 226         .compat_setsockopt = compat_sock_common_setsockopt,
 227         .compat_getsockopt = compat_sock_common_getsockopt,
 228 #endif
 229 };
 230
 231
 232 /*
 233  * Create a socket. Initialise the socket, blank the addresses
 234  * set the state.
 235  */
 236 static int ieee802154_create(struct net *net, struct socket *sock,
 237                              int protocol, int kern)
 238 {
 239         struct sock *sk;
 240         int rc;
 241         struct proto *proto;
 242         const struct proto_ops *ops;
 243
 244         if (!net_eq(net, &init_net))
 245                 return -EAFNOSUPPORT;
 246
 247         switch (sock->type) {
 248         case SOCK_RAW:
 249                 proto = &ieee802154_raw_prot;
 250                 ops = &ieee802154_raw_ops;
 251                 break;
 252         case SOCK_DGRAM:
 253                 proto = &ieee802154_dgram_prot;
 254                 ops = &ieee802154_dgram_ops;
 255                 break;
 256         default:
 257                 rc = -ESOCKTNOSUPPORT;
 258                 goto out;
 259         }
 260
 261         rc = -ENOMEM;
 262         sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto);
 263         if (!sk)
 264                 goto out;
 265         rc = 0;
 266
 267         sock->ops = ops;
 268
 269         sock_init_data(sock, sk);
 270         /* FIXME: sk->sk_destruct */
 271         sk->sk_family = PF_IEEE802154;
 272
 273         /* Checksums on by default */
 274         sock_set_flag(sk, SOCK_ZAPPED);
 275
 276         if (sk->sk_prot->hash)
 277                 sk->sk_prot->hash(sk);
 278
 279         if (sk->sk_prot->init) {
 280                 rc = sk->sk_prot->init(sk);
 281                 if (rc)
 282                         sk_common_release(sk);
 283         }
 284 out:
 285         return rc;
 286 }
 287
 288 static const struct net_proto_family ieee802154_family_ops = {
 289         .family         = PF_IEEE802154,
 290         .create         = ieee802154_create,
 291         .owner          = THIS_MODULE,
 292 };
 293
 294 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
 295         struct packet_type *pt, struct net_device *orig_dev)
 296 {
 297         if (!netif_running(dev))
 298                 return -ENODEV;
 299         pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
 300 #ifdef DEBUG
 301         print_hex_dump_bytes("ieee802154_rcv ", DUMP_PREFIX_NONE, skb->data, skb->len);
 302 #endif
 303
 304         if (!net_eq(dev_net(dev), &init_net))
 305                 goto drop;
 306
 307         ieee802154_raw_deliver(dev, skb);
 308
 309         if (dev->type != ARPHRD_IEEE802154)
 310                 goto drop;
 311
 312         if (skb->pkt_type != PACKET_OTHERHOST)
 313                 return ieee802154_dgram_deliver(dev, skb);
 314
 315 drop:
 316         kfree_skb(skb);
 317         return NET_RX_DROP;
 318 }
 319
 320
 321 static struct packet_type ieee802154_packet_type = {
 322         .type = __constant_htons(ETH_P_IEEE802154),
 323         .func = ieee802154_rcv,
 324 };
 325
 326 static int __init af_ieee802154_init(void)
 327 {
 328         int rc = -EINVAL;
 329
 330         rc = proto_register(&ieee802154_raw_prot, 1);
 331         if (rc)
 332                 goto out;
 333
 334         rc = proto_register(&ieee802154_dgram_prot, 1);
 335         if (rc)
 336                 goto err_dgram;
 337
 338         /* Tell SOCKET that we are alive */
 339         rc = sock_register(&ieee802154_family_ops);
 340         if (rc)
 341                 goto err_sock;
 342         dev_add_pack(&ieee802154_packet_type);
 343
 344         rc = 0;
 345         goto out;
 346
 347 err_sock:
 348         proto_unregister(&ieee802154_dgram_prot);
 349 err_dgram:
 350         proto_unregister(&ieee802154_raw_prot);
 351 out:
 352         return rc;
 353 }
 354 static void __exit af_ieee802154_remove(void)
 355 {
 356         dev_remove_pack(&ieee802154_packet_type);
 357         sock_unregister(PF_IEEE802154);
 358         proto_unregister(&ieee802154_dgram_prot);
 359         proto_unregister(&ieee802154_raw_prot);
 360 }
 361
 362 module_init(af_ieee802154_init);
 363 module_exit(af_ieee802154_remove);
 364
 365 MODULE_LICENSE("GPL");
 366 MODULE_ALIAS_NETPROTO(PF_IEEE802154);