path: root/net/ieee802154/socket.c

/*
 * IEEE802154.4 socket interface
 *
 * Copyright 2007, 2008 Siemens AG
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Written by:
 * Sergey Lapin <slapin@ossfans.org>
 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
 */

#include <linux/net.h>
#include <linux/capability.h>
#include <linux/module.h>
#include <linux/if_arp.h>
#include <linux/if.h>
#include <linux/termios.h>	/* For TIOCOUTQ/INQ */
#include <linux/list.h>
#include <linux/slab.h>
#include <net/datalink.h>
#include <net/psnap.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <net/route.h>

#include <net/af_ieee802154.h>
#include <net/ieee802154_netdev.h>

/* Utility function for families */
static struct net_device*
ieee802154_get_dev(struct net *net, const struct ieee802154_addr *addr)
{
	struct net_device *dev = NULL;
	struct net_device *tmp;
	__le16 pan_id, short_addr;
	u8 hwaddr[IEEE802154_ADDR_LEN];

	switch (addr->mode) {
	case IEEE802154_ADDR_LONG:
		ieee802154_devaddr_to_raw(hwaddr, addr->extended_addr);
		rcu_read_lock();
		dev = dev_getbyhwaddr_rcu(net, ARPHRD_IEEE802154, hwaddr);
		if (dev)
			dev_hold(dev);
		rcu_read_unlock();
		break;
	case IEEE802154_ADDR_SHORT:
		if (addr->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST) ||
		    addr->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
		    addr->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST))
			break;

		rtnl_lock();

		for_each_netdev(net, tmp) {
			if (tmp->type != ARPHRD_IEEE802154)
				continue;

			pan_id = tmp->ieee802154_ptr->pan_id;
			short_addr = tmp->ieee802154_ptr->short_addr;
			if (pan_id == addr->pan_id &&
			    short_addr == addr->short_addr) {
				dev = tmp;
				dev_hold(dev);
				break;
			}
		}

		rtnl_unlock();
		break;
	default:
		pr_warn("Unsupported ieee802154 address type: %d\n",
			addr->mode);
		break;
	}

	return dev;
}

static int ieee802154_sock_release(struct socket *sock)
{
	struct sock *sk = sock->sk;

	if (sk) {
		sock->sk = NULL;
		sk->sk_prot->close(sk, 0);
	}
	return 0;
}

static int ieee802154_sock_sendmsg(struct socket *sock, struct msghdr *msg,
				   size_t len)
{
	struct sock *sk = sock->sk;

	return sk->sk_prot->sendmsg(sk, msg, len);
}

static int ieee802154_sock_bind(struct socket *sock, struct sockaddr *uaddr,
				int addr_len)
{
	struct sock *sk = sock->sk;

	if (sk->sk_prot->bind)
		return sk->sk_prot->bind(sk, uaddr, addr_len);

	return sock_no_bind(sock, uaddr, addr_len);
}

static int ieee802154_sock_connect(struct socket *sock, struct sockaddr *uaddr,
				   int addr_len, int flags)
{
	struct sock *sk = sock->sk;

	if (addr_len < sizeof(uaddr->sa_family))
		return -EINVAL;

	if (uaddr->sa_family == AF_UNSPEC)
		return sk->sk_prot->disconnect(sk, flags);

	return sk->sk_prot->connect(sk, uaddr, addr_len);
}

static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
				unsigned int cmd)
{
	struct ifreq ifr;
	int ret = -ENOIOCTLCMD;
	struct net_device *dev;

	if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
		return -EFAULT;

	ifr.ifr_name[IFNAMSIZ-1] = 0;

	dev_load(sock_net(sk), ifr.ifr_name);
	dev = dev_get_by_name(sock_net(sk), ifr.ifr_name);

	if (!dev)
		return -ENODEV;

	if (dev->type == ARPHRD_IEEE802154 && dev->netdev_ops->ndo_do_ioctl)
		ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);

	if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))