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