4 * Phonet network device
6 * Copyright (C) 2008 Nokia Corporation.
8 * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
9 * Original author: Sakari Ailus <sakari.ailus@nokia.com>
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * version 2 as published by the Free Software Foundation.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
26 #include <linux/kernel.h>
27 #include <linux/net.h>
28 #include <linux/netdevice.h>
29 #include <linux/phonet.h>
31 #include <net/phonet/pn_dev.h>
33 /* when accessing, remember to lock with spin_lock(&pndevs.lock); */
34 struct phonet_device_list pndevs = {
35 .list = LIST_HEAD_INIT(pndevs.list),
36 .lock = __SPIN_LOCK_UNLOCKED(pndevs.lock),
39 /* Allocate new Phonet device. */
40 static struct phonet_device *__phonet_device_alloc(struct net_device *dev)
42 struct phonet_device *pnd = kmalloc(sizeof(*pnd), GFP_ATOMIC);
46 bitmap_zero(pnd->addrs, 64);
48 list_add(&pnd->list, &pndevs.list);
52 static struct phonet_device *__phonet_get(struct net_device *dev)
54 struct phonet_device *pnd;
56 list_for_each_entry(pnd, &pndevs.list, list) {
57 if (pnd->netdev == dev)
63 static void __phonet_device_free(struct phonet_device *pnd)
69 struct net_device *phonet_device_get(struct net *net)
71 struct phonet_device *pnd;
72 struct net_device *dev;
74 spin_lock_bh(&pndevs.lock);
75 list_for_each_entry(pnd, &pndevs.list, list) {
79 if (net_eq(dev_net(dev), net) &&
80 (dev->reg_state == NETREG_REGISTERED) &&
81 ((pnd->netdev->flags & IFF_UP)) == IFF_UP)
87 spin_unlock_bh(&pndevs.lock);
91 int phonet_address_add(struct net_device *dev, u8 addr)
93 struct phonet_device *pnd;
96 spin_lock_bh(&pndevs.lock);
97 /* Find or create Phonet-specific device data */
98 pnd = __phonet_get(dev);
100 pnd = __phonet_device_alloc(dev);
101 if (unlikely(pnd == NULL))
103 else if (test_and_set_bit(addr >> 2, pnd->addrs))
105 spin_unlock_bh(&pndevs.lock);
109 int phonet_address_del(struct net_device *dev, u8 addr)
111 struct phonet_device *pnd;
114 spin_lock_bh(&pndevs.lock);
115 pnd = __phonet_get(dev);
116 if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs))
117 err = -EADDRNOTAVAIL;
118 else if (bitmap_empty(pnd->addrs, 64))
119 __phonet_device_free(pnd);
120 spin_unlock_bh(&pndevs.lock);
124 /* Gets a source address toward a destination, through a interface. */
125 u8 phonet_address_get(struct net_device *dev, u8 addr)
127 struct phonet_device *pnd;
129 spin_lock_bh(&pndevs.lock);
130 pnd = __phonet_get(dev);
132 BUG_ON(bitmap_empty(pnd->addrs, 64));
134 /* Use same source address as destination, if possible */
135 if (!test_bit(addr >> 2, pnd->addrs))
136 addr = find_first_bit(pnd->addrs, 64) << 2;
139 spin_unlock_bh(&pndevs.lock);
143 int phonet_address_lookup(struct net *net, u8 addr)
145 struct phonet_device *pnd;
147 spin_lock_bh(&pndevs.lock);
148 list_for_each_entry(pnd, &pndevs.list, list) {
149 if (!net_eq(dev_net(pnd->netdev), net))
151 /* Don't allow unregistering devices! */
152 if ((pnd->netdev->reg_state != NETREG_REGISTERED) ||
153 ((pnd->netdev->flags & IFF_UP)) != IFF_UP)
156 if (test_bit(addr >> 2, pnd->addrs)) {
157 spin_unlock_bh(&pndevs.lock);
161 spin_unlock_bh(&pndevs.lock);
162 return -EADDRNOTAVAIL;
165 /* notify Phonet of device events */
166 static int phonet_device_notify(struct notifier_block *me, unsigned long what,
169 struct net_device *dev = arg;
171 if (what == NETDEV_UNREGISTER) {
172 struct phonet_device *pnd;
174 /* Destroy phonet-specific device data */
175 spin_lock_bh(&pndevs.lock);
176 pnd = __phonet_get(dev);
178 __phonet_device_free(pnd);
179 spin_unlock_bh(&pndevs.lock);
185 static struct notifier_block phonet_device_notifier = {
186 .notifier_call = phonet_device_notify,
190 /* Initialize Phonet devices list */
191 void phonet_device_init(void)
193 register_netdevice_notifier(&phonet_device_notifier);
196 void phonet_device_exit(void)
198 struct phonet_device *pnd, *n;
200 rtnl_unregister_all(PF_PHONET);
202 spin_lock_bh(&pndevs.lock);
204 list_for_each_entry_safe(pnd, n, &pndevs.list, list)
205 __phonet_device_free(pnd);
207 spin_unlock_bh(&pndevs.lock);
209 unregister_netdevice_notifier(&phonet_device_notifier);