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