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 /*
  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 ||
 151              dev->type == ARPHRD_IEEE802154_PHY) &&
 152             dev->netdev_ops->ndo_do_ioctl)
 153                 ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);
 154
 155         if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))
 156                 ret = -EFAULT;
 157         dev_put(dev);
 158
 159         return ret;
 160 }
 161
 162 static int ieee802154_sock_ioctl(struct socket *sock, unsigned int cmd,
 163                 unsigned long arg)
 164 {
 165         struct sock *sk = sock->sk;
 166
 167         switch (cmd) {
 168         case SIOCGSTAMP:
 169                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 170         case SIOCGSTAMPNS:
 171                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 172         case SIOCGIFADDR:
 173         case SIOCSIFADDR:
 174                 return ieee802154_dev_ioctl(sk, (struct ifreq __user *)arg,
 175                                 cmd);
 176         default:
 177                 if (!sk->sk_prot->ioctl)
 178                         return -ENOIOCTLCMD;
 179                 return sk->sk_prot->ioctl(sk, cmd, arg);
 180         }
 181 }
 182
 183 static const struct proto_ops ieee802154_raw_ops = {
 184         .family            = PF_IEEE802154,
 185         .owner             = THIS_MODULE,
 186         .release           = ieee802154_sock_release,
 187         .bind              = ieee802154_sock_bind,
 188         .connect           = ieee802154_sock_connect,
 189         .socketpair        = sock_no_socketpair,
 190         .accept            = sock_no_accept,
 191         .getname           = sock_no_getname,
 192         .poll              = datagram_poll,
 193         .ioctl             = ieee802154_sock_ioctl,
 194         .listen            = sock_no_listen,
 195         .shutdown          = sock_no_shutdown,
 196         .setsockopt        = sock_common_setsockopt,
 197         .getsockopt        = sock_common_getsockopt,
 198         .sendmsg           = ieee802154_sock_sendmsg,
 199         .recvmsg           = sock_common_recvmsg,
 200         .mmap              = sock_no_mmap,
 201         .sendpage          = sock_no_sendpage,
 202 #ifdef CONFIG_COMPAT
 203         .compat_setsockopt = compat_sock_common_setsockopt,
 204         .compat_getsockopt = compat_sock_common_getsockopt,
 205 #endif
 206 };
 207
 208 static const struct proto_ops ieee802154_dgram_ops = {
 209         .family            = PF_IEEE802154,
 210         .owner             = THIS_MODULE,
 211         .release           = ieee802154_sock_release,
 212         .bind              = ieee802154_sock_bind,
 213         .connect           = ieee802154_sock_connect,
 214         .socketpair        = sock_no_socketpair,
 215         .accept            = sock_no_accept,
 216         .getname           = sock_no_getname,
 217         .poll              = datagram_poll,
 218         .ioctl             = ieee802154_sock_ioctl,
 219         .listen            = sock_no_listen,
 220         .shutdown          = sock_no_shutdown,
 221         .setsockopt        = sock_common_setsockopt,
 222         .getsockopt        = sock_common_getsockopt,
 223         .sendmsg           = ieee802154_sock_sendmsg,
 224         .recvmsg           = sock_common_recvmsg,
 225         .mmap              = sock_no_mmap,
 226         .sendpage          = sock_no_sendpage,
 227 #ifdef CONFIG_COMPAT
 228         .compat_setsockopt = compat_sock_common_setsockopt,
 229         .compat_getsockopt = compat_sock_common_getsockopt,
 230 #endif
 231 };
 232
 233
 234 /*
 235  * Create a socket. Initialise the socket, blank the addresses
 236  * set the state.
 237  */
 238 static int ieee802154_create(struct net *net, struct socket *sock,
 239                 int protocol)
 240 {
 241         struct sock *sk;
 242         int rc;
 243         struct proto *proto;
 244         const struct proto_ops *ops;
 245
 246         if (net != &init_net)
 247                 return -EAFNOSUPPORT;
 248
 249         switch (sock->type) {
 250         case SOCK_RAW:
 251                 proto = &ieee802154_raw_prot;
 252                 ops = &ieee802154_raw_ops;
 253                 break;
 254         case SOCK_DGRAM:
 255                 proto = &ieee802154_dgram_prot;
 256                 ops = &ieee802154_dgram_ops;
 257                 break;
 258         default:
 259                 rc = -ESOCKTNOSUPPORT;
 260                 goto out;
 261         }
 262
 263         rc = -ENOMEM;
 264         sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto);
 265         if (!sk)
 266                 goto out;
 267         rc = 0;
 268
 269         sock->ops = ops;
 270
 271         sock_init_data(sock, sk);
 272         /* FIXME: sk->sk_destruct */
 273         sk->sk_family = PF_IEEE802154;
 274
 275         /* Checksums on by default */
 276         sock_set_flag(sk, SOCK_ZAPPED);
 277
 278         if (sk->sk_prot->hash)
 279                 sk->sk_prot->hash(sk);
 280
 281         if (sk->sk_prot->init) {
 282                 rc = sk->sk_prot->init(sk);
 283                 if (rc)
 284                         sk_common_release(sk);
 285         }
 286 out:
 287         return rc;
 288 }
 289
 290 static struct net_proto_family ieee802154_family_ops = {
 291         .family         = PF_IEEE802154,
 292         .create         = ieee802154_create,
 293         .owner          = THIS_MODULE,
 294 };
 295
 296 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
 297         struct packet_type *pt, struct net_device *orig_dev)
 298 {
 299         if (!netif_running(dev))
 300                 return -ENODEV;
 301         pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
 302 #ifdef DEBUG
 303         print_hex_dump_bytes("ieee802154_rcv ", DUMP_PREFIX_NONE, skb->data, skb->len);
 304 #endif
 305
 306         if (!net_eq(dev_net(dev), &init_net))
 307                 goto drop;
 308
 309         ieee802154_raw_deliver(dev, skb);
 310
 311         if (dev->type != ARPHRD_IEEE802154)
 312                 goto drop;
 313
 314         if (skb->pkt_type != PACKET_OTHERHOST)
 315                 return ieee802154_dgram_deliver(dev, skb);
 316
 317 drop:
 318         kfree_skb(skb);
 319         return NET_RX_DROP;
 320 }
 321
 322
 323 static struct packet_type ieee802154_packet_type = {
 324         .type = __constant_htons(ETH_P_IEEE802154),
 325         .func = ieee802154_rcv,
 326 };
 327
 328 static int __init af_ieee802154_init(void)
 329 {
 330         int rc = -EINVAL;
 331
 332         rc = proto_register(&ieee802154_raw_prot, 1);
 333         if (rc)
 334                 goto out;
 335
 336         rc = proto_register(&ieee802154_dgram_prot, 1);
 337         if (rc)
 338                 goto err_dgram;
 339
 340         /* Tell SOCKET that we are alive */
 341         rc = sock_register(&ieee802154_family_ops);
 342         if (rc)
 343                 goto err_sock;
 344         dev_add_pack(&ieee802154_packet_type);
 345
 346         rc = 0;
 347         goto out;
 348
 349 err_sock:
 350         proto_unregister(&ieee802154_dgram_prot);
 351 err_dgram:
 352         proto_unregister(&ieee802154_raw_prot);
 353 out:
 354         return rc;
 355 }
 356 static void __exit af_ieee802154_remove(void)
 357 {
 358         dev_remove_pack(&ieee802154_packet_type);
 359         sock_unregister(PF_IEEE802154);
 360         proto_unregister(&ieee802154_dgram_prot);
 361         proto_unregister(&ieee802154_raw_prot);
 362 }
 363
 364 module_init(af_ieee802154_init);
 365 module_exit(af_ieee802154_remove);
 366
 367 MODULE_LICENSE("GPL");
 368 MODULE_ALIAS_NETPROTO(PF_IEEE802154);