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