linux/net/ieee802154/af_ieee802154.c
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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 */
  46struct 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
  96static 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}
 106static 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
 114static 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
 125static 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
 139static 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
 167static 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
 188static 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
 213static 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 */
 243static 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        }
 291out:
 292        return rc;
 293}
 294
 295static const struct net_proto_family ieee802154_family_ops = {
 296        .family         = PF_IEEE802154,
 297        .create         = ieee802154_create,
 298        .owner          = THIS_MODULE,
 299};
 300
 301static 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
 322drop:
 323        kfree_skb(skb);
 324        return NET_RX_DROP;
 325}
 326
 327
 328static struct packet_type ieee802154_packet_type = {
 329        .type = __constant_htons(ETH_P_IEEE802154),
 330        .func = ieee802154_rcv,
 331};
 332
 333static 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
 354err_sock:
 355        proto_unregister(&ieee802154_dgram_prot);
 356err_dgram:
 357        proto_unregister(&ieee802154_raw_prot);
 358out:
 359        return rc;
 360}
 361static 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
 369module_init(af_ieee802154_init);
 370module_exit(af_ieee802154_remove);
 371
 372MODULE_LICENSE("GPL");
 373MODULE_ALIAS_NETPROTO(PF_IEEE802154);
 374
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