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![Rémi Denis-Courmont](/assets/img/avatar_default.png)
Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
210 lines
5 KiB
C
210 lines
5 KiB
C
/*
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* File: pn_dev.c
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*
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* Phonet network device
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*
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* Copyright (C) 2008 Nokia Corporation.
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*
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* Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
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* Original author: Sakari Ailus <sakari.ailus@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <linux/kernel.h>
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#include <linux/net.h>
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#include <linux/netdevice.h>
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#include <linux/phonet.h>
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#include <net/sock.h>
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#include <net/phonet/pn_dev.h>
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/* when accessing, remember to lock with spin_lock(&pndevs.lock); */
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struct phonet_device_list pndevs = {
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.list = LIST_HEAD_INIT(pndevs.list),
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.lock = __SPIN_LOCK_UNLOCKED(pndevs.lock),
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};
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/* Allocate new Phonet device. */
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static struct phonet_device *__phonet_device_alloc(struct net_device *dev)
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{
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struct phonet_device *pnd = kmalloc(sizeof(*pnd), GFP_ATOMIC);
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if (pnd == NULL)
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return NULL;
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pnd->netdev = dev;
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bitmap_zero(pnd->addrs, 64);
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list_add(&pnd->list, &pndevs.list);
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return pnd;
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}
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static struct phonet_device *__phonet_get(struct net_device *dev)
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{
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struct phonet_device *pnd;
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list_for_each_entry(pnd, &pndevs.list, list) {
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if (pnd->netdev == dev)
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return pnd;
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}
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return NULL;
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}
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static void __phonet_device_free(struct phonet_device *pnd)
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{
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list_del(&pnd->list);
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kfree(pnd);
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}
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struct net_device *phonet_device_get(struct net *net)
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{
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struct phonet_device *pnd;
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struct net_device *dev;
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spin_lock_bh(&pndevs.lock);
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list_for_each_entry(pnd, &pndevs.list, list) {
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dev = pnd->netdev;
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BUG_ON(!dev);
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if (net_eq(dev_net(dev), net) &&
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(dev->reg_state == NETREG_REGISTERED) &&
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((pnd->netdev->flags & IFF_UP)) == IFF_UP)
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break;
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dev = NULL;
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}
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if (dev)
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dev_hold(dev);
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spin_unlock_bh(&pndevs.lock);
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return dev;
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}
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int phonet_address_add(struct net_device *dev, u8 addr)
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{
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struct phonet_device *pnd;
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int err = 0;
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spin_lock_bh(&pndevs.lock);
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/* Find or create Phonet-specific device data */
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pnd = __phonet_get(dev);
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if (pnd == NULL)
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pnd = __phonet_device_alloc(dev);
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if (unlikely(pnd == NULL))
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err = -ENOMEM;
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else if (test_and_set_bit(addr >> 2, pnd->addrs))
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err = -EEXIST;
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spin_unlock_bh(&pndevs.lock);
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return err;
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}
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int phonet_address_del(struct net_device *dev, u8 addr)
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{
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struct phonet_device *pnd;
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int err = 0;
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spin_lock_bh(&pndevs.lock);
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pnd = __phonet_get(dev);
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if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs))
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err = -EADDRNOTAVAIL;
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else if (bitmap_empty(pnd->addrs, 64))
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__phonet_device_free(pnd);
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spin_unlock_bh(&pndevs.lock);
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return err;
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}
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/* Gets a source address toward a destination, through a interface. */
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u8 phonet_address_get(struct net_device *dev, u8 addr)
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{
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struct phonet_device *pnd;
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spin_lock_bh(&pndevs.lock);
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pnd = __phonet_get(dev);
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if (pnd) {
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BUG_ON(bitmap_empty(pnd->addrs, 64));
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/* Use same source address as destination, if possible */
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if (!test_bit(addr >> 2, pnd->addrs))
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addr = find_first_bit(pnd->addrs, 64) << 2;
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} else
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addr = PN_NO_ADDR;
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spin_unlock_bh(&pndevs.lock);
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return addr;
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}
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int phonet_address_lookup(struct net *net, u8 addr)
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{
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struct phonet_device *pnd;
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spin_lock_bh(&pndevs.lock);
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list_for_each_entry(pnd, &pndevs.list, list) {
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if (!net_eq(dev_net(pnd->netdev), net))
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continue;
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/* Don't allow unregistering devices! */
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if ((pnd->netdev->reg_state != NETREG_REGISTERED) ||
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((pnd->netdev->flags & IFF_UP)) != IFF_UP)
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continue;
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if (test_bit(addr >> 2, pnd->addrs)) {
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spin_unlock_bh(&pndevs.lock);
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return 0;
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}
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}
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spin_unlock_bh(&pndevs.lock);
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return -EADDRNOTAVAIL;
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}
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/* notify Phonet of device events */
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static int phonet_device_notify(struct notifier_block *me, unsigned long what,
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void *arg)
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{
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struct net_device *dev = arg;
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if (what == NETDEV_UNREGISTER) {
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struct phonet_device *pnd;
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/* Destroy phonet-specific device data */
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spin_lock_bh(&pndevs.lock);
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pnd = __phonet_get(dev);
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if (pnd)
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__phonet_device_free(pnd);
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spin_unlock_bh(&pndevs.lock);
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}
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return 0;
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}
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static struct notifier_block phonet_device_notifier = {
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.notifier_call = phonet_device_notify,
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.priority = 0,
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};
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/* Initialize Phonet devices list */
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void phonet_device_init(void)
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{
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register_netdevice_notifier(&phonet_device_notifier);
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}
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void phonet_device_exit(void)
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{
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struct phonet_device *pnd, *n;
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rtnl_unregister_all(PF_PHONET);
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rtnl_lock();
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spin_lock_bh(&pndevs.lock);
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list_for_each_entry_safe(pnd, n, &pndevs.list, list)
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__phonet_device_free(pnd);
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spin_unlock_bh(&pndevs.lock);
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rtnl_unlock();
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unregister_netdevice_notifier(&phonet_device_notifier);
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}
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